I have a 20 gallon tank and can't really add an undertank fuge... I'm thinking of having the intake in the back right corner and having a 6-12" sump going the tanks length and then having that go into a fuge about 12-14" wide and then having it go back into the tank in the front left top corner of the tank. This should give me around 10 more gallons and a lot of pod support... Do you think that that 200gph would be a strong enough flow? Would a fuge about 12"x12" filled with chaeto give me enough pod support for a mandarin?