Sometimes with new filters some initial bio-slime buildup can occur in the lines and other areas within the filter. The stuff can slough off and go flying around in the tank. If that's what happened, it's kinda unsightly but won't hurt anything. And usually after a day or two it's gone. But, it's always good to stay on top of things, esp. when they're a little bit new.
- I would break open the new canister filter. Once opened up, Inspect everything and rinse all of the media with aquarium water. Make sure nothing got pinched or folded up. Reassemble and it should be good-to-go.
- Have you tried putting a foam, intake pre-filter on your canister and HOB filter intakes?
Just use a rubber band if the foam pre-filter doesn't fit tight to the filter intake. These work great to extend the time between filter 'clean-downs', will enhance biological capacity by adding just a bit more surface area for beneficial bacteria to colonize and work great as improvised sponge filters if you lose power and are temporarily using battery powered air pumps.
https://www.cichlid-forum.com/articles/ ... ailure.php Plus, try measuring the Nitrate level twice. Both right before conducting a 50 percent (plus) water change, then immediately after. You'll see the actual results of your water change actions then. And definitely, keep the water change routine going! Those guys in there are just gonnna keep growing. You will probably want to do higher and higher percentage water changes in that never-ending fight against Nitrate buildup in the tank. The battle never ends, man.....
