i just realized that in one of my t's tanks (the 10 gallon) there is mold growing on the side that the water dish is on... this t always spills his water for some reason and after he puts his cricket remains in it and uses it (the dish) as a toilet.. anyways now i realized that that whole end is growing with mold and i was wondering why? considering the temperature is 75 degrees ferenheight and the whole lid is screened meaning there is a lot of ventalation... is this bad for the t?? help! 