I have recently adopted 3 clown loaches. 1x 5 inch and 2x 3 inch to go with my 2 i already had.... there is a considerable difference in colour... my original 2 are bright and defined... the adoptees are very pale... are they unwell? the tank they come from looked very clean and healthy and from a knowledgable owner. I am a newby at this but have been responsible for my tank with no fatality's that im very pleased about... any advice would be greatly received!