It's a Fluval canister filter. I run the sponges through the wash machine (without the soap) a couple times and rinse all the ceramic beads.
The fish tumors were more like blisters (I broke one once, it drained, didnt kill the fish but more grew). One by one, all 3 fish got the "uglies" but it didnt seem to affect their health. It's all very strange. Whatever it is, the turtle isn't affected.
