u/Ashduff

Posted about this a bit ago but didn't get anything helpful and it's happening again. I have 2 brand new AC30s running on my 10 and 20g. i have had nonstop issues with them randomly stalling in the night and waking up to a cloudy tank and the impeller motor being hot to the touch. am i doing something wrong? the intake is at the bottom of both tanks with a clean prefilter sponge, im using the little black spacer thing to keep it straight, im priming it every time and still it's continually stalling. Ive taken apart the entire motor and impeller and its not debris, its not power since i can still hear it running when stalled and it gets hot. I have 2 sponge filters coming for other tanks but i think after i get them cycled im just gonna replace the HOBs because they are pissing me off. i tried warranty and they said they'd send another one but i don't want that if it's gonna be the same thing.
Has this happened to anyone else and does anyone have any idea why?

I am 100% sure I saw a big snail leech pop in and out of one of my large snails in an establishing tank yesterday. i put the snail in a closed breeder box within the tank for now but looking for what to do? it's a 20g long that i'm maturing with only snails in it, one mystery 2 rabbit one spixi (leech) and assorted ramshorn,bladder, and one pond. the infected snail was gifted to me recently with the other large ones

main 2 questions:
what thing do i put in the water to kill the leech? ideally without killing snails but if so ill remove my large ones and as many small as i can then do it

what do i do with the actual infected snail beyond isolate?