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I would go bigger than eheim 2213. I had a 2215 on my 21.5 gallon and thought it was too little flow, so I ended up buying a 2217 impeller for the 2215. I could have just gone with a 2217 but a 2215 with a 2217 impeller should be fine.

Bump: People do that. Use canister as mostly biological and HOB as mostly mechanical. Others just use one big canister to do both.
 
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