I used a hot magnum in my 20 for 4 years. My tank was great. No issues what so ever related to it's use. It was a pain to maintain a HOB canister so I removed it.
I ran carbon and foam only. Which was changed monthly.
I am now adding a Rena xp1 to replace my not-so-reliable-during-blackouts aqua clear.
If you clean it monthly, you will be fine.
Avoid fluval entirely. A nightmare to service. And it needs priming manually. Junk.
Rena is self priming and easy to maintain.
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