Not sure how much room you have in your garage, but if it were me I would build a supporting wall in your garage directly below your tank. Make it floor to floor 12 inch centers with construction grade 2 x 6 and tie it in to the existing joist. If your anything like me you can always use more shelving in your garage ....
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Starting fresh ... 90 gal, 40gal sump, sundial T5HO x 4, 2 x koralia 2's, ASM G1X skimmer
