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[Tangster]

with a 45 gal tank I'd stay close to just a 10 Gal fuge and I'd also locate it remotely and not in line water passing through a sump would be moving to fast to do any god the way a fuge works it like a salt marsh or mud flat in that the water passes through it really slow a 10 gal fuge you want to run about 10 GPH through it that will allow time for the solids to settle out and feed the plants now if you are using Mangroves red or white then faster water flows are needed and Beneficial.. if you get to fast of flows with a algae fuge or scrubber the plants will not get enough food. Thats why I always use a fuge about 10% of the tank total volume its serving then 10% of the fuges volume per hr through the fuge.
This method has never failed me or anyone Ii know of yet.. You can get them to large.. many have watched their algaes go asexual bleach out hite and release their toxins and and go to seed or die in attempt to save themselves from starvation.. and total death of the algae plants..