i have the model 200 on a 150gal, i'm placing an order by Dec for a 300 gal marineland. Will the model 200 be enough are should i upgrade to the 400?
Depends on our bio load. Your 200 should be able to handle the 300D tank if you are not keeping a lot of fish. If you do plan to keep large amount of fish or large size fish then a 400 would be best. I am currently running a I-Tech 400 on my 150g SPS dominated.