| | Re: Sunsun Canister Filter Opinions
I used an Eheim with a flow rate of 265? gph on my 40b for years and it was plenty, so 525 gph would be more than enough.
Is this for your Walstad tank? If so, choose a filter that allows you to easily use mechanical media only. This is all you need. Biomedia may actually be counter-productive because it coverts the ammonia that plants use very easily to nitrate which is more difficult to use.