So it's the last day of 25% off at Petsmart and I'm looking at this thing:




I want a parrot ciclid, but that's just lying to myself.
It's probably going to end up with goldfish. They're currently in a 50 gal tote with a sump - I had no problem drilling a $20 plastic tote. Wouldn't want to drill that nice glass.

Can I get away with maybe some HOBs for 3 (maybe 4 if I put the female with the boys) large fancy goldfish?

I got a birthday Aquaclear 110 sitting around still in the package, but I doubt that'll be enough.... What should I do - I'm not even sure how to filter this thing, and the sale ends today.

I would just get two Fancy Goldfish for that 50 gallon tank. Goldfish are a huge bioload. The AquaClear 110 should be OK for that tank; alas, if you can afford another filter then maybe a canister filter like an Eheim 2213.

I... could add a 2nd filter and it can be a canister. Never had one. How effective would something like this be since I won't be drilling an intake?

I have a corner tank (92) and I don't think that I'd like it being off the wall far enough for a HOB. I run a wet-dry and sump.

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Canisters are very effective for bigger tanks. No drilling of the tank glass should be necessary. Look at your stand; hopefully, there should be an opening underneath to run the input and output hoses behind and up to the top of the tank.

You may have to create an opening in your tank hood to allow for the hoses.

You could also run a corner filter. I can't decide if I want to run a corner or canister, probably canister.
Cornerfilter Shop - SWISSTROPICALS

That's OK if the OP wants to keep just fish. If this is a planted tank with fish, the Matten Filter is going to need a motor pump that outlet pipes below the water surface. Because with the air lift system it will rapidly disperse all the CO2 the Goldfish make and the plants won't succeed as well.

Can I ask the OP if I can suggest an alternative fish for this tank?