Advice me on filter.

[Supergrass]

Hi, I'm relatively new to planted tank.

I have 3 feet planted tank (not dense with plants) with 3 adult discus, 3 cardinals, 1 clown loach, 4 SAE and 5 oto. I also have 2L CO2 inject to it.

Problem is that I can't afford to have an external cannister filter due to space constrain (have tried my very best to find some). What kind of filter would you advice me to get?

[loupgarou]

if you can't get any external filter, then a power filter will have to do, if you don't mind outgassing, then a eheim liberty type also useful.

[juggler]

Having a power head or internal filter is useful as you can connect a CO2 reactor to it to better dissolve the CO2.