Posted: Wed Apr 01, 2015 1:04 pm Re: indoor pond setup?
I wouldn't use sand alone as a basking spot. Plus, I can't think of many plants that would grow in it. If you go to the bottom of the "Clueless on Outdoor Setups" thread in the "Habitat - Outdoors" section, it shows my recommended design for a space-efficient floating basking spot. Aquatic plants to consider are anacharis/elodea, hornwort, duckweed, frog bit, water lettuce, and water hyacinth--although the turtles will probably tear them up and eat them. Your setup would do well with a Fluval FX5 filter, or you could build your own.
Also, you mention regularly cleaning your filters. Does this include bio-media? You don't have to clean that, unless it's covered in brown film. Even then, only wash it with tank water. Tap water kills the beneficial bacteria that grows on it.
If the drain you mention is the drain plug on the stock tank, don't use that. They are known for leaking. It's easier to just remove water using a pump.