I need help diagnosing what my spiny softshell turtle might have.... Some info: I have 7 baby turtles (3 months old) in a 39 gallon long tank. The water is filled about 8 inches and the substrate is half black aquarium sand (washed well) and half river rocks (also washed well). The filter I have is a ZooMed 318 turtle filter recommended for 30 gallon aquariums. I also have a large basking platform under a powersun mercury vapor bulb. So here's the deal... The turtles have been in incredibly good health since I got them. I have 2 Mississippi maps 2 penn cooters 2 spiny softshells and 1 yellow belly slider. Recently I've noticed that one of the baby spiny turtles hasn't been eating, and has been spending the majority of its time directly under the hottest part of the bulb. This was quite a shock to me because I rarely ever see the spiny turtles basking. He is very lethargic, and doesn't respond to anything, I can put my hand in the tank and touch him and he won't even move. What should I do?