One of my gymonothorax polyurodon loves to get in my aqueon quietflow, has one it three times now and i have no idea how or why he does it but i have to literally unplug the filter, and take all the media out and usually try to hand grab him but hes so damn slippery and just goes into the very small area where water goes in where i cant even put a single finger in so i have to take the entire thing off and then dump it over a bucket and blow out the back until he feels like falling out ugh its so annoying. Im currently curing him of fish lice though i hope he poles through, no idea where he got them as ive had him for a few months and he never had them before, maybe because of being in the filter for a few days the times that i dont notice hes gone, i have 4 and hes the only one that does it wtf.