Well, as per your guys' suggestions, Kuwabara has gotten himself a new pad
Aqua Culture size 10 tank - waaaay too much space for my little guy, I know. Hence the lower water level (which will also help with maintaining the water temperature, yes?). I have a filter for him too, that seems to have a VERY low flow; it's actually made for a tank of 5 gallons max, so I'm unsure if I should be using it continually, or just when I do a total water change? And since the water level is lower than the tank size, I do worry about the high currant. (Suggestions would be helpful there!)
Sadly, there wasn't a lid for the tank available at my local Walmart (God, I hate that place some days), but that's definitely next on the list! Along with a thermometer and some more plants for my little bully!
He adores the skull hidey hole, though. When I came back this afternoon from a day of errands, I panicked because I couldn't find him anywhere! He was comfortably happy hiding in the little skull cave, scaring the pants off his Momma.