Planted Tank Obsessed
Join Date: Dec 2016
Location: CT River Valley, CT, USA
Go with the 75. Not only is it more difficult to work in a 90G, but it’s also harder to fill the vertical space with hardscape. A lot of 90s feel empty in the top 6” anyway, and it would be a better presentation if the whole vertical space was full. Add to that the fact that 90s are tougher to effectively light than a 75, and it seems like a win/win. In my 90, I was constantly trying to balance growth at the substrate with algae up high, and I never quite won the battle. Now that I have a 125G (2” less in height), I can see the problems with the 90. The reason for the 75 over the 55 is the difference in footprint, in that it’s much easier to scape with the added front to back depth.
If you ever think you're too small to make a difference, spend a couple of nights sleeping with a mosquito.
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