Hi could someone please help me i have a 33gal(UK) tank and i recently bought 5 Blue Green Chromis and also a french angel well after acclimatizing them I put them in my tank and they started to eat well when i fed them but the next day I noticed my angel to have slightly changed colour well I rang theplace where I bought him and I told them my water parameters are fine also I told them my SG is 1.024 they told that that might be a problem they have there water at 1.020 and that is why the sudden change in colour but don't worry he will acclimatize to the water well I wanted to get my waters sg down to there level so over the next couple of days i lowered it down to 1.020 thinking that will help him but when i woke up today i noticed that nearly all his body is now a greyish shade also he isn't eating he is still a juvenille he is about 2 1/2 inches long