IceCap Gravity ATO fit check
IceCap Gravity ATO is an ATO system from IceCap. Listed features: Powerless gravity/pressure-differential top-off (no electronics); Includes 500 mL inverted bottle reservoir; Long/short dual-tube system auto-refills as water evaporates. ReefCrafter's catalog fit range is 1-40 gallon systems. ReefCrafter treats ATO as a salinity-stability purchase, so check sensor redundancy, reservoir size, and pump lift before automation extras.
IceCap Gravity ATO: fits roughly 1-40 gallon systems. Specs, compatibility math, sizing risks, and alternatives before you buy.
Who it is for
Good fit for
- ✓ 1-40 gallon systems, per the catalog fit range.
- ✓ Small or open-top tanks where daily evaporation swings salinity fastest.
Not a fit for
- ✕ Systems over about 40 gallons without adding capacity elsewhere.
- ✕ Builds that have not yet decided on reservoir placement and pump lift.
Listed features
- Powerless gravity/pressure-differential top-off (no electronics)
- Includes 500 mL inverted bottle reservoir
- Long/short dual-tube system auto-refills as water evaporates
- Rim-mounts with three inserts for varied tank thicknesses
- Tubing trims to set the target water level; fresh or salt
Specs checked against coralvue.com.
Compatibility math
Build role
Example: IceCap Gravity ATO belongs in the plan only if it solves a real stability or maintenance job.
ReefCrafter keeps optional upgrades behind core stability requirements.
Risk notes
- Manual top-off works until a busy week turns evaporation into a salinity spike.
Professional fit context
- Check sensor redundancy, reservoir size, pump lift, fail-safes, and whether dosing is needed yet.
- IceCap Gravity ATO fits roughly 1-40 gallon systems; confirm that range against the final display volume, sump volume, and livestock plan.
Alternatives to compare
- AutoAqua Smart ATO Micro
Catalog fit range 5-55 gallon systems (budget tier).
- Tunze Osmolator 3 Nano Auto Top Off
Catalog fit range 5-66 gallon systems (budget tier).
- XP Aqua Sumpless ATO Auto Top-Off
Catalog fit range 5-75 gallon systems (budget tier).
Full spec snapshot
- Category
- ATO / Dosing
- Build tier
- Budget
- Estimated price
- $21
- Tank fit range
- fits roughly 1-40 gallon systems
- Format
- ATO System
Related reading
Questions
What tank size is the IceCap Gravity ATO for?
ReefCrafter's catalog fit range for it is 1-40 gallon systems. Confirm that against your final display volume, sump volume, and livestock plan rather than the box label alone.
What should I compare the IceCap Gravity ATO against?
AutoAqua Smart ATO Micro (Catalog fit range 5-55 gallon systems (budget tier)); Tunze Osmolator 3 Nano Auto Top Off (Catalog fit range 5-66 gallon systems (budget tier)); XP Aqua Sumpless ATO Auto Top-Off (Catalog fit range 5-75 gallon systems (budget tier)).
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