yeah the tank is overstocked... and with that water change it probably destroyed enough of the nitrosomas and nitro bacter to start an ammonia spike in the tank.
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210 Gal Reef w/ 55 Gallon Sump/Fuge, 125 Gal Fish Only, 65 Gal Seahorse-29 Gallon Sump, 55 Gal FOWLR, 54 Gal Corner FW Community, 20 Gal Nano FOWLR, 55 Gal Piranha, 29 gallon QT
"All the yellow tangs and clownfish in the world can't save you now! hahahah" Peter from Family Guy
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