I was at wal-mart and saw these internal box filter that you can adjust its level on the inside of the tank. It was made for low water tanks for turtles and others I thought it would be good for the mudskipper that is coming. It was made by whisper. What do you think?
They hang on the rim inside the tank, yeah I've seen em. I don't think they'd be very efficiant for a turtle (aquatic turtles's are messy). I use a slightly modified Fluval . I've heard good things about the ZooMeds too.
internal box filters are one of the oldest and most effetive filters. Most people don't use them anymore because they look ugly in the tank. But they ar echeap and effective.