Hello; I agree with everything in duanes post and especially like these two lines. He is right on. Let me add an observation or two.In my large cichlid tanks, I clean mechanical media with every water change (for me, that's 30-40% every other day).
Leaving turds and other crap in a filter is the same as if you swept dog turns under a rug.
Hello; I agree with everything in duanes post and especially like these two lines. He is right on. Let me add an observation or two.
I have run tanks with only a sponge filter many times. The sponge filter is very good at aeration with a bubbler and can be a decent surface for colonization of beneficial bacteria (bb).
They do trap some stuff mechanically but this is not their big talent. Run one a while then squeeze it out and you will see. The operation should not matter with regard to the type of fish.
From reading threads on this forum I sometimes get a feeling some members think that a lot of power filtration with a large capacity for media somehow means the filter will "take care" of the waste and other detritus in a tank. The power filters do trap the stuff but as Duanes says the poo, excess food and other junk just rots in a different place other than in plain sight. A power filter should have mechanical media at the very least. That media needs to be cleaned or replaced so as to remove the stuff from the closed system.
You can also load a filter with media intended to become a home for the bb but this is a different aspect to tank well being but can be made to work in a power filter in a neat way.
In a sponge filter tank the bb will colonize surfaces throughout the tank so that is not a problem. The sponges bubble aeration can and does set up some circulation of the water which helps get the water past the bb as well.
So yes you can run an Oscar tank with a sponge filter. I would likely run a few of them as plenty of bubblers keep the water moving in the size tank needed for an Oscar. In the end you are the cleanup crew and the WC you do are the main thing.