3/4" return should be plenty for a tank that size
a 1" drain would be ok unless you plan on keeping large snails which could potentially block it
a mag 350 puts out ~ 200 GPH @ 6 ' head pressure so a 1" drain would have to be almost clogged solid to cause a flood
id drill 2 holes and do a herbie style overflow silent and virtually flood proof
return(s) over the back of tank
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250G DD LED SPS R.I.P.
180G LED SPS
80"x36". 300G custom build
Owner of Mountain Ridge Heating and Gas
Class A gas fitter, HVAC
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