I noticed you have a pump in your ali'snap pond. I hope yours is nothing like mine, cause he took a taste out of his and pretty much destroyed the pump and the hose connected to it.
Thats why my set up is a overflow filter. Where the turtle water drains from the top into a 75 gal rubbermaid tub full of bio-balls and a pond filter pad and then is pumped back into its tub via a spray bar. I'm planning to hook up a big heater and a chemical filter in the near future (in other words, till I get more fundage). I won't put anything in its water unless its food. He tends to bite first and then ask questions later.