what other filter would be good? for my breeding discus tank

[dam0]

what other filter would be good for my breeding discus tank? i am currently running 2 sponge filters i want to run something else to purify the water, what do use suggest?

[waitaki]

hang on filters are good for breeding tanks, but not a heavy flowing one

[Hollowman]

A single sponge is more than enough. Just do more water changes.