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First, I would not use aragonite or pea gravel in the substrate. For a tank that size I would buy a bag of black Flourite Sand and use that.
I would use tap water instead of RO water.
I would use Excel as a carbon source, and dose KNO3 and KH2PO4 plus a trace element mix, such as Flourish to feed the plants.
The reason you had problems with blue green algae is the lack of nitrates in the water.
One 32 watt PC, if it has a bulb with color temperature between about 5500K and 10,000K, will be adequate for an Excel tank.
I would use tap water instead of RO water.
I would use Excel as a carbon source, and dose KNO3 and KH2PO4 plus a trace element mix, such as Flourish to feed the plants.
The reason you had problems with blue green algae is the lack of nitrates in the water.
One 32 watt PC, if it has a bulb with color temperature between about 5500K and 10,000K, will be adequate for an Excel tank.