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Reef advice that answers the expensive question first.
Not generic blog posts. Each guide opens with the direct answer, shows the ReefCrafter math, and hands you the next action before a weak build becomes a real purchase.
Equipment · 10 min read
Reef tank equipment list for a stable first build
A practical reef tank equipment list that separates must-have gear from optional upgrades before the first cart gets expensive.
water gallons x 8.3 lb, then add rock, sand, stand, and gear
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Budget · 9 min read
How much does a reef tank cost?
Estimate reef tank startup cost by tank size, reef goal, equipment tier, hidden consumables, and the first 90 days.
real budget = startup cart + first-90-day supplies + repair cushion
Read the check →Return Pump · 8 min read
What size return pump do I need for a reef tank?
Size a reef tank return pump by real GPH after head loss, overflow limits, noise, and sump turnover instead of box rating alone.
system gallons x 5 to 10 = target delivered GPH
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Tank Format · 9 min read
AIO vs sump reef tank: which should beginners choose?
Compare all-in-one and sumped reef tanks by setup difficulty, upgrade path, noise, equipment space, cost, and beginner risk.
simpler setup + smaller footprint - equipment room
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Skimmer · 7 min read
Is my protein skimmer too small?
Check whether your skimmer rating has enough headroom for your tank volume, reef goal, and bioload before you buy or upgrade.
display gallons x 1.5
Read the check →Flow · 8 min read
How much flow does a reef tank need?
Calculate a practical flow target for soft coral, LPS, mixed reef, and SPS systems without confusing return-pump turnover for coral flow.
display gallons x 10
Read the check →Lighting · 8 min read
Is my reef lighting strong enough?
Check reef lighting by coral goal, PAR target, and footprint coverage instead of picking a fixture from tank gallons alone.
tank length x tank width <= total fixture coverage
Read the check →Heating · 7 min read
Reef tank heater size and safety check
Size reef tank heaters with enough wattage to hold temperature without creating a dangerous stuck-on failure risk.
display gallons x 2.5
Read the check →Build Check · 9 min read
Check your reef build before buying
A pre-buy reef tank checklist for catching weak gear, missing essentials, and expensive mismatches before checkout.
display gallons x 1.5, 2.0, or 2.5
Read the check →Water Chemistry · 8 min read
How long does a reef tank take to cycle?
A practical reef cycling timeline that separates ammonia processing, testing confidence, and stocking readiness.
Readiness = ammonia 0 + nitrite 0 after the tank processed a known ammonia source
Read the check →Water Chemistry · 8 min read
How to lower nitrates in a reef tank without shocking livestock
Lower reef nitrate with feeding control, water changes, export capacity, and patient trend tracking.
Nitrate trend = nutrient input - nutrient export
Read the check →Water Chemistry · 8 min read
How to lower phosphates in a reef tank safely
Reduce reef phosphate without stripping nutrients too quickly or destabilizing corals.
Phosphate pressure = food input + source water + detritus release - export
Read the check →Troubleshooting · 8 min read
Reef tank algae problems: find the cause before buying a cure
Diagnose common reef algae causes by light, nutrients, source water, flow, stocking, and maintenance.
Algae pressure = available nutrients + light + surfaces + weak export
Read the check →Troubleshooting · 8 min read
Cyano vs dinos in a reef tank
Tell cyano and dinoflagellates apart before changing nutrients, flow, lighting, or treatment strategy.
Risk = misidentification x treatment strength
Read the check →Equipment · 8 min read
ATO setup guide for reef tanks
Set up an auto top off system around salinity stability, reservoir size, sensor safety, and failure modes.
Reservoir days = reservoir gallons / daily evaporation gallons
Read the check →Equipment · 8 min read
Reef controller setup guide for useful safety
Use a reef controller for real safety: heater cutoff, alerts, pump control, and monitoring without replacing husbandry.
Controller value = monitored risk + reliable alert + controlled response
Read the check →Maintenance · 8 min read
How to maintain reef tank filters without causing a nutrient spike
Clean reef mechanical, chemical, and biological filtration on a schedule that protects stability.
Mechanical media value drops when trapped detritus decomposes
Read the check →Water Chemistry · 8 min read
RODI water for reef tanks
Plan RODI water around source-water risk, filter stages, storage, TDS checks, and algae prevention.
RODI readiness = clean source + maintained filters + clean storage
Read the check →Water Chemistry · 8 min read
Reef tank salinity stability
Keep reef salinity stable with ATO, calibrated testing, RODI water, and water-change discipline.
Evaporation removes water but leaves salt behind
Read the check →Water Chemistry · 8 min read
Reef tank alkalinity stability
Plan alkalinity testing, demand tracking, water changes, and dosing without chasing daily noise.
Daily demand = yesterday alkalinity - today alkalinity after accounting for dosing
Read the check →Water Chemistry · 8 min read
Reef tank dosing for beginners
Start reef dosing only after testing shows repeatable demand from coral growth.
Dose need = measured daily consumption - water-change replacement
Read the check →Maintenance · 8 min read
Reef tank water change schedule
Choose a reef water-change schedule based on tank size, nutrient trend, dosing demand, and stability.
A water change reduces dissolved pollutants roughly by the changed percentage
Read the check →Livestock · 8 min read
Where to place corals in a reef tank
Place corals by light, flow, aggression, growth shape, and room for future colonies.
Placement fit = PAR band + flow band + aggression space + maturity
Read the check →Livestock · 8 min read
Stocking order for a beginner reef tank
Build a beginner stocking order around cycling, aggression, bioload, maturity gates, and coral readiness.
Bioload pace = new livestock load <= export and bacteria margin
Read the check →Livestock · 8 min read
Cleanup crew for a reef tank
Size a reef cleanup crew by tank maturity, algae type, food availability, and compatibility.
Cleanup crew need = available food + tank footprint + algae type
Read the check →Disease · 8 min read
Quarantine reef fish for beginners
Plan beginner fish quarantine around observation, ammonia control, stress reduction, and display protection.
QT readiness = biological filter + oxygen + temperature + observation time
Read the check →Disease · 8 min read
Marine ich in a reef tank
Understand marine ich response options, quarantine limits, display fallow planning, and why reef-safe shortcuts fail.
Display risk = exposed fish + parasite life cycle + stress
Read the check →Livestock · 8 min read
When can I add an anemone to a reef tank?
Decide anemone readiness by tank maturity, light, flow, pump protection, and stability history.
Anemone readiness = maturity + stable light + stable flow + protected pumps
Read the check →Tank Format · 8 min read
Choosing your first reef tank size
Choose a first reef tank size by stability, budget, equipment fit, floor load, and livestock ceiling.
Filled water weight starts around gallons x 8.3 lb
Read the check →Lighting · 8 min read
Reef tank lighting explained for beginners
Understand reef lighting by PAR, coverage, spread, spectrum, schedule, and coral goal before buying LEDs.
Coverage target = tank length x tank width
Read the check →Flow · 8 min read
Where to place wavemakers in a reef tank
Place wavemakers to create broad, turbulent flow without blasting corals or leaving detritus dead spots.
Turnover = total powerhead GPH / display gallons
Read the check →Flow · 8 min read
Flow requirements for SPS, LPS, and soft corals
Plan flow zones for SPS, LPS, and soft corals without treating the whole tank as one average number.
Soft/LPS planning band = roughly 10-30x turnover
Read the check →Maintenance · 8 min read
Reef tank maintenance schedule for beginners
Build a reef maintenance schedule for daily observation, weekly testing, water changes, filter cleaning, and monthly gear checks.
Maintenance interval shortens as feeding, bioload, and coral demand rise
Read the check →How this library scales
ReefCrafter expands from problems users already have: fired rules, abandoned planner steps, repeated forum questions, and shared builds that reveal a real decision pattern. More pages only ship when they can carry useful math, a clear next action, and a reviewed source trail.
Spotted a guide that’s wrong, or a pre-buy question we haven’t covered? Email rules@reefcrafter.com. Reviewed before anything ships.