I believe some people have done it successfully. It is more risky though. If you do just test it before putting fish in it. Check out this thread: DIY Rimless Betta Tank & Filter | 451795 | Freshwater Aquarium BuildsAquaticQueen said:I have been considering for a while, taking the rims off my 10 gallon tank. Would it be safe as in would it leak?
Unfortunately, I don't have a PetCo within about a thousand miles from where I live.CindyVBPets said:Yeah...Just go get a rimless one at Petco - they're on sale this week cheap like...$14.99 or so.