We went on vacation for 5 days and had a friend feed our fish once a day. My Blue damsel is very pale and not swimming well. My 2 clowns are swimming sideways, my other damsels are swimming at the bottom of the tank. They all seem very distraught! What do I do if all of the pet stores are closed on the fourth of July?
Water changes ASAP with temperature matched, properly conditioned water. Your friend likely overfed the tank which caused spikes ammonia/nitrite. Check your parameters immediately.