I have the same tank. The filter seemed to strong for Buster too so I baffeled it with a ziplock snack bag with some marbles and water in it. Then placed it over the out flow. Seems fine now. Buster will wiggle his way behind the bag then rocket out with the flow like a water slide though.
He seems to like it.
The first one that I bought from Wal-Mart was broken up just like yours too! I turned around and went right back, got me another one, checked it out in the store
, then came home. NOT A GOOD DAY. I am 30 - 35 minutes away from
Wal-Mart! Made me so mad. Thankfully, they did have one other one at the store and it was ok.