Here's my 29 gallon from before I broke it down. Mostly fake although there are a few live in there
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Why not go low light, slow grow with no CO2 in the 55 ? I did this with my 46BF, and it doesn't look bad. I use liquid ferts 1x per week, and I may have to trim the Amazon sword back every 4 or 5 months. Very low maintenance - which fits me perfectly ! Good luck.