Can I keep a red bubble tip anemone with a 5" zoa rock

[Makubex]

In a 55?, also where can i get a cover for my powerhead? Its a jebao sow

 

[Timfish]

For awhile, maybe a couple months, maybe a couple years, maybe a couple decades. BTAs may stay in one spot for very long times or they may go walking or they may split then go walking.

I'd try some plastic gutter screen or leaf guard and tie wraps form your local homne improvemnt store