filter troubleshooting

Hey yall I got a new spiney eels he’s currently about 14 or so enches long and about an inch in diameter he’s truly beautiful.. but! He incessantly tries to swim into the canisters outflow and he knocks it off and has scraped his head once. Any idea on how to deter him from doing this and...

So I have two emperor 400 filters running in my 75 gallon tank. The most recent of the two filters has suddenly acquired a massive problem. I was going to to turn the filters back on, as I do weekly for my water changes. Filters purged back up all the way of course before turning back on. The...