I have eight glass/ghost/invisible/phantom catfish. Poor things. They have no definitive name! There are two kinds of glass/ghost catfish, apparently. I noticed that one of them suddenly turned 'white'. Is there a ghost/glass/invisible/phantom catfish expert out there to advise whether there is something wrong with this fish? ((LOL!!!) It's a 75 g tank. I've had them for about four months. The parameters are perfect. Perhaps Casper has a disease peculiar to the breed. I noticed today, that another one is also turning 'white'. I'm certain that this is a 'Casper' issue. Photos were taken from my cell, three inches away from Casper. Apologies for quality.