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If it was a rectangle, I could tell you for 275 L it would be two and you would have plenty of coverage up to a 340L. Once you go over that, you are getting close to needing three, again depending on the mount. For a 121 L it would definitely be 1 light.
I hope this is helpfulVery cool pieces!! A square footprint let you do something very different from the rectangular tank. If you have not already, start a journal so we can follow progress!
Tank needs a proper good clean first as its not a new one lol xx
