I have a 30-gallon tank with two oscellaris clownfish, a wrasse, a firefish, three snails and two corals (an Australian Duncan and a torch) and a bubble-tip anemone. I woke up to find the corals/anemone all closed up and the fish sluggish/discoloured and on the bottom of the tank. The wrasse and firefish just died. Most of the algae disappeared overnight and I've done tests for ammonia (a little up, but I added Fritz Zyme 9 to stabilize it) and Ph/nitrates/phosphates were normal. Help – I don't want to lose my clownfish!