Filtration for a 450g

[tcav88]

My 450g has 3 drains 2 returns 1 of the drains i was gonna but a ball valve for water changes other 2 were gonna drain into the sump

 

[tcav88]

My 450g has 3 drains 2 returns 1 of the drains i was gonna put a ball valve for water changes other 2 were gonna drain into the sump which is a 125g i havent drilled yet.

 

[JK47]

JK47 should be able to chime in with some useful info.

One question tho you mentioned the drains are 1.5 inch but are there other drains drilled ? Does the setup have emergency drains ? If so then you should size everything to match what the e drains can handle.

Drains under full siphon pull much more water than gravity fed drains, are u using any valves ?

Not much else for me to chime in with. ragin_cajun offered up the same thing (to the pumps) I would have recommended. Big K1 sump and higher turn over, done. I have a lot of tanks done this way as well and you can't argue with proven methods. I'm setting up a 180 gallon K1 sump for one of my setups right now actually.