Not my tank, it's at my doctor's office. They have an undergravel filter which has been in place since it was installed about 15 years ago. The front of the tank faces the waiting room and the back of the tank is in their billing/file room. It is on a built in stand and they didn't put doors on it or anything. I'm really not sure what's in/under the stand. Behind the tank they have the copy machine, postage machine, shredder, etc. On one side of the aquarium is a counter with more equipment and the other side is the door. Not much room for anything...or even to put a ladder to clean...very tight fit.
Do you not think 3 dual bakpaks would do a very good job?
The only way I can put a skimmer on is if it hangs on.