Your tank is large enough that either of these components is a big part of it.Let the filter filter and run the c02 on a separate pump.As your filter clogs and it is running a reactor or UV, the performance of these components will suffer as the flow decreases.Ģ) How will you 'hide' the inlet and outlet bulkheads inside the tank? They will be visible above your substrate.I was going to have 2x1.5" inlets and 4x1" outlets and was struggling with placement as I wanted the flexibility to view the tank from ALL 4 SIDES. The choices are all yours of course, but here are some thoughts on why I chose a different path:ġ) Keep filtration and c02 separate if possible. keep that in mind.they will also eat your rummies as they get bigger if they can catch them.and they will certainly try. I have a 180 and have kept many hundreds of small fish but I still tend to overfilter.angels on the other hand can be large and will produce a lot of waste. Will you run a UV and heater from the canister? I personally think both of your choices may be too small for your goals and tank size.will you use c02? How will you diffuse it? the gph will be a bit optimistic from the mfg and head height, etc may also reduce a bit.better to overfilter than under. The more input flow you have the more output you can have and more flexibility if desired.you never know if things will change in the future. You can then feed your dual intake eheim models if desired.Or split to also feed a UV or hydor inline heater. I am doing a custom 220 and decided NOT to drill the bottom.this was after much thought and 'discussion' here and with Tom.I had wanted from the start to go that route but decided not to.but my application and configuration/goals are different than yours.ġ.5 or 2" bulkhead for the intake.