It might depend on the species but for me getting algae to grow was key as that brought on biodiversity. What's your no3 and po4 tests?
Do you have sand bed? My po4 wouldn't show up on test kits. Over feeding helped but I ended up dosing liquid phosphate to actually get readings. Feed the food chain from the bottom up. Can try just over feeding fish, but there's also mb7, Oyster feast, reef chili, phyto, etc
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