I have the 75g Marineland, and yes i had a hard time with the fittings too, because the overflow kit said to use a 1" drain and 3/4" return. The thing they didnt mention is that the bulkheads are both 1-1/4", so i had to buy a reducer for the drain, and two reducers for the return. so it kinda went like this...
drain- 1-1/4"- 1"
Return- 1-1/4"- 1"- 3/4"
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75 gallon FOWLR for now- 2x250w MH Current USA Outer Orbit with T5 actinic, Vortech MP40
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