E600 Glue Safe for bettas?

I couple of weeks ago my betta's fins were sucked into the filter of my three-gallon tetra cube betta tank (the filter came with the tank). It was a horrible accident, and he did not survive. I have since then let the tank cycle and return to normal/safe parameters (0 ammonia, nitrite, and nitrate), and I got a new betta this weekend. To prevent another filter encounter, I used a rubber band and women's hose to cover the filter intake. However, this has drastically slowed my filter. I have to readjust it every twelve hours or so because the cloth begins to clog the intake. Due to the reduced flow, a protein biofilm is accumulating on top of the water.
Obviously, I need to change something. I could get a new filter, but I'm a college student, so spending the money for a good, safe filter is not optimal right now, although I will if necessary. My thought is to get some of the black sponge media that goes inside some filters and use E600 Glue to attach it to the intake of the filter. What do you think? Is E600 safe to be in the tank after it's dry? I really just want to prevent another fin disaster. Thanks for the advice!

 

Idk about E6000 glue, that stuff is potent. Hot glue or Aquarium silicone should work well enough. You could also get pure, 100% silicone with no additives to prevent mold and that sort of thing. But I always go for the aquarium made stuff out of paranoia.

 

The only glue that's considered safe for aquarium use is super glue, the gel version is easier to work with. Hot glue works too, but it eventually wears off. Silicone is also fine, but overkill for a small thing.

 

Oh yeah, forgot about super glue for some reason...

 

Super glue is perfectly safe in the aquarium but I wouldn't let your betta use it unsupervised. They don't have fingers to grip the bottle properly and in my experience are not very careful when using products.