Hello, everyone. Thanks for the feedback! Couple of quick notes:
joey - I was able to add about 5 more gallons of water and the turtles don't seem to be plotting any sort of escape. Thank you for the suggestion.
meltedspork - The light pictured in the photo there is a UVA/UVB light. I had the light much closer positioned before and the turtles did not tolerate the light being so bright, so close. They basically hid from it and never basked. I started to notice that my turtles' eyes were reddened and they rubbed at them frequently. I talked to a couple of people from my area with turtles and they suggested that the light was actually procuding a kind of sunburn effect on my turtles' eyeballs, sooo I moved it further away. They bask each and every day now (yay!). So far as a heat lamp, I guess I thought that my little light there would provide them with what they needed. I will need to get a mercury vapor bulb. Thank you for the suggestions.
missmandy - Thanks! So far as my water is concerned I do partial water changed weekly and complete water changes every four weeks. The filter seems to be working pretty efficiently, but I have seen the bad effects of poor water quality from some of the other local turtle owners around here and never want my little weenies to be in a situation like that.
More photos to come! Thank you all for the suggestions.
-Jen