I want to add a bubble wall to my 55 gallon. I had an old Hagen Optima that
I bought for a non fishy purpose about 20 years ago, but it's toast. I don't
imagine it's worth fixing, so what's a good alternative, Whisper, Tetratec?

It should be cheap, quiet and have amazing output! But I'd settle for
reasonably quiet and decent output. Should I use a couple of the long
airstones for my wall or use the weighted tubes?