I have my 180G DT/100G refuge on the second floor without issue. However I do have 2 load bearing walls and enginneered floor joices under the tank. Engineered floors are laminated not just plain wood strips, so they are much stronger.
It would be best to have joices going under the tank. Is there at least one joice under things, or is the tank between the wall and the first joice? If so, things could/would most likely sag over time.
Best bet is to have someone look at it.
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Setup: 180G DT, 105G Refuge (approx. 300lbs LR, 150lbs Aragonite)
Hardware: Super Reef Octopus SSS-3000, Tunze ATO, Mag 18 return, 2x MP40W, 2X Koralia 4's Wavemaker
Lighting: 5ft Hamilton Belize Sun (2x250W MH, 2X80W T5HO)
Type of Aquarium: mixed reef (SPS & LPS) with fish
Dosing: Mg, Ca, Alk
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