I have a 6.6 Petco bookshelf tank. It's a betta heaven for my Monet. When I bought the tank, it came with a cheapy HOB made by god-knows-who.... but I kept it because it was quite and had enough space in it's housing for me to add more material for BB to colonize on. Right now it has some extra AC sponge and biomax pack, in addition to its chinsey poor-excuse for a cartridge. It was also super quite for being so cheap AND it was adjustable.... which is great for a betta. ANYHOW. In the process of rearranging this tank last night, I ended up on a nerite snail hunt. So the hunt ended in the filter housing. Which required me to shut off the filter.... float the media in some tank water.... dig out the snail..... and while i was in there, clean the intake tube. So then I put it all back together and it starts making a RACKET. Okay, now a racket to me isn't much. HOB filters technically annoy me. But the thing was wisper quiet before and now it sounds like it has air bubbles stuck in it that are trying to bang their way out with little crobars. ??? Not sure how else to explain that one. I tinkered with it for a hour until I finally gave up. Ended up adjusting the flow all the way down and putting my DIY bottle baffle on it and just TOLERATING the noise. Ugh. So I guess i'm looking for any idea of what the heck happened here? OR I was contemplating throwing the HOB against the wall (lol) and getting something else. Does any company make....like.... a canister type external filter that wouldn't be complete over kill and a waste of money for a 6.6g? I'd probably have to baffle the spray bar, but I'm prepared for that. Any input would be much appreciated!