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Compatibility-first buying guides built around gallons, reef goal, sizing rules, and safety margin. These are fit lanes, not hands-on product rankings.
Start with the tank shape. A 20-long needs light across about 30 inches; a 20-high is shorter but deeper. Choose the spread and mounting arrangement for the places your corals will actually grow, then compare the complete cost.
For a 36 × 18 inch 40-breeder, compare two AI Prime reef lights, an AI Blade Coral Grow strip arrangement, or two Radion XR15 fixtures when the coral plan justifies extra output. Check coverage across the whole coral area and count the required lights and mounts before comparing prices.
Heating a 40 gallon mixed reef tank means staying inside the 100-200 watt band (2.5-5 W/gal). 100W glass heater, Two smaller heaters, and Controller-backed titanium system are fit lanes by wattage, redundancy, and control.
Heating a 120 gallon SPS tank means staying inside the 300-600 watt band (2.5-5 W/gal) and splitting heat across two heaters near 150 W each. Split glass heaters, Titanium heater pair, and Controller-backed redundant heater system are fit lanes by wattage, redundancy, and control.
A balanced 32 gallon soft coral build runs roughly $1,500-$2,375 to start. The gear that carries it: a skimmer near 64 gallons of rating, about 640 GPH of flow, and lighting in the 50-150 PAR band. Disciplined budget setup, Balanced beginner setup, and Premium stability setup are spend lanes.
A budget 32 gallon soft coral build runs roughly $750-$1,200 to start. The gear that carries it: a skimmer near 64 gallons of rating, about 640 GPH of flow, and lighting in the 50-150 PAR band. Budget soft-coral plan, Used non-critical gear plan, and Upgrade-ready budget plan are spend lanes.
A balanced 75 gallon mixed reef build runs roughly $3,500-$5,575 to start. The gear that carries it: a skimmer near 150 gallons of rating, about 2,250 GPH of flow, and lighting in the 150-250 PAR band. Balanced mixed reef stack, LPS-friendly mixed stack, and Upgrade-ready mixed stack are spend lanes.
A premium 120 gallon SPS build runs roughly $9,700-$15,400 to start. The gear that carries it: a skimmer near 240 gallons of rating, about 6,000 GPH of flow, and lighting in the 250-350 PAR band. Entry SPS-ready stack, Balanced SPS stability stack, and Premium SPS redundancy stack are spend lanes.
A fit guide narrows one decision. The planner checks every pick against your gallons, reef goal, and budget together, so one good choice doesn't hide another weak spot.
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