No it would be for a new betta. It’s a canister suction cup filter so you just stick it on.Are you moving the betta from the 5 to the 10?
I would assume it should be ok as it is one fish and I assume you would keep up with general water changes. Second opinion?
Yes it will beWill it be a planted tank?
I think you'll be ok then. Some floating plants or anacharis would be good at helping remove ammoniaYes it will be