Ok, so maybe the only dumb question is the one not asked. LOL, so I was thinking about putting one of those black housing pieces in the tank-the one that hides all the internal workings of the tank. What the heck is this thing called? I have been trying to find out if you can buy one separately or make one--it seems like this would be a good option to help octo proof a tank. So, any help I could get would be great. Thanks!