I know this has been discussed before. Loud rave music, black lights, crushed up vitamin C and XTC in the water will yield much better results then red wine and Barry Manilow.... They're just reaching maturity, not the end of thier lives......
Didn't mean to crap in anyone's corn flakes here guys..... It may just be me, or my water, or the way I keep my rays.
Most people that are/have bred Marbles have had them for a good period of time. They don't seem to cope well with change. It took me 3 years to get my first batch and that mom was 18-20inch across by most hobbyists standards. Not saying they are difficult to breed, just seem to require a whole lot of patience. Something I lack. Mine don't seem to like being moved around, having or being newly introduced rays, or changes to thier enviroment. More of that patience garbage..... LOL