I'm planning on getting a new filter for my 20 high tank. Right now i have an aqua clear which i don't really like. The only other filters I've used are whisper and marineland. Would like to know what my options are.
I would say an AC 30 is good. I personally think they are hard to beat, I've had decent luck with Marineland Penguin filters, id says a Penguin 200 would work for your size tank as well
I didn't like our first AC either but now love them. The lack of self-priming & the leveling piece were a PITA. And they do need to be pretty level! I still have & use old Whispers but wouldn't buy them again. I have a Whisper 30 & AC 50 on my 20 long.
There are smaller canisters like Eheim you might try. But canisters are more of a PITA to clean IMO. I only use larger ones on big tanks, never tried small.
I've heard of it done, but an AC70 or 110 on a 20g tank is a LOT of water movement. Not sure if it was here, but one dude claimed to have had an AC110 on a 10g. Talk about glass face plant..