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Two things would bring your tank into balance......

The best option, BY FAR, would be to leave your light alone and add pressurized CO2. Doing it isn't as hard as you might think. Getting started requires an initial investment, but the results will be nothing short of astonishing.

The second option is to cut down on the quantity of light. Shortening the photoperiod might help some, but your plants currently aren't able to make use of all of the available light energy. They're probably carbon and nutrient starved. Excel works fine, but it really can't keep up with "high light" tanks, IME.

Seachem ferts are wonderful products, but for larger tanks, the expense is not trivial. Bulk, dry fertilizers (powdered KNO3, KH2PO4, K2SO4, CaSO4, MgSO4, etc.) are cheap as dirt. A few kilos will last years.

If you're using RO, rocks with CaCO3 (those that fail the acid test) are working against you. The easiest way to use RO is to add a small quantitiy of regular tapwater to it. The exact amount depends on the GH/KH that you're aiming for and the particular hardness of your tapwater.
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