How to keep tank clean?

How does everyone keep their tanks so hecking clean? I've had axel in his tank for a week and he's so messy. Seriously don't know how you guys keep your tanks so spotless? He poops and flings it absolutely everywhere. He's so gross 🤢 I'm also struggling with feeding him in his tank since he had me hand feeding him worms ect in his tub. Now he's not having any of it so all advice is great. How long do I leave a live worm in his tank? Trying to avoid hand feeding as I really really struggle with it due to a disability. His ammonia and nitrite are 0 and is nitrate is 4 (is this too high)