how many anem in 45gal

Depends on the type of anemone... What do you have now or what interests you as far as the anemones? Then we can go from there.
 
all type i think maybe 10

You have 10 types? Or you want 10 types?

If you want BTAs, you could easily fill a tank with 20+ of them. If you want haddonis, you would be lucky to get 3 and they would be on top of each other at full size. In both cases, you would be so full up you wouldn't be able to see the rocks though...

It really comes down to the kind you want and the look you are going for.
 
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