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i have a 20 gallon qt that has been set up for three months. Filtering with AquaClear 20 HOB with sponge and Matrix biomedia (both three months old). It went through one cycle. I’ve qt’d two clowns (together) and a coral beauty with no problems. Every time I try to qt a tang, the ammonia spikes...

i have a new 55 gallon reef tank that is about three months old. No fish yet. I’ve added clean up crew and a few soft corals so far. Salinity is at 1.023, nitrates at 20, nitrites at 0, and ammonia at 0. How’re pH is at 8.7. I’d like to lower to a more coral acceptable range before adding fish...

I have a new 55 gallon reef tank that is about two months old now. Everything did great for the first seven weeks. Ammonia, pH, nitrates, and salinity are all normal. I have a sufficient cleanup crew to start including eight red leg crabs, six turbo snails, and two peppermint shrimp. Started...