Thanks for that, all nitrate, ph, etc is perfect in the tank. I don't buy my fish from a petstore I am lucky enough to buy direct from a wholesaler (friends, you know) and they were perfectly healthy. My tank is 200ltrs (or a little over), I have 3 comets, 3 dwarf gouramis, 7 lemon tetras, 6 serpae tetras, 1 neon rainbow, 5 bristlenose, 1 red tail black shark, 3 Bala Sharks and 1 ghost knife. I feel so useless, my poor angels. I tempered them first before introducing them to the big tank. They were eating well but after I put them in the big tank I had to make sure that they I feed both ends of the tank so that they would eat. I feed high quality flakes, bloodworms,
brine shrimp, and vegetables (pumpkin, zucchini, etc) My tank filter cycle is 1200ltr/hr. My water even looks really clean, you know what I mean. I didn't know that they were going to be such a disaster - I sure the Angels feel so betrayed... Also tank temp sits at 26c