Beginner & Setup Guides
Fish-Only With Live Rock (FOWLR) Setup Guide
Building a fish-only system with live rock for tangs, angels, and aggressive species that are not coral safe.
FOWLR systems prioritize fish behavior and biodiversity over coral, opening the door to species like tangs, angels, and triggers that would devastate a reef. With less light demand and looser parameters, FOWLR is also easier and cheaper to run.
Tank size
Minimum 75 gallons for tangs, 125 gallons for angels, 180+ for aggressive predators.Filtration
Higher bioload means stronger skimming and more aggressive water changes — 20% biweekly minimum.Related reading
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