I am building a very unique vivarium/terrarium/pond in my house. I have the lizard and dart frog set-ups pretty well dialed, but turtles and ponds are new to me. as I am about to start the building process on the structure, I was hoping I might get some advice or tips from people out here who have indoor ponds. I am curious if it would be better to go with a preform, or to build one myself. also, if I only intend on having a few fish and some turtles what type of pump will I need for filtering. hoping to gain some first hand knowlege, thanks in advance