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With that kind of light you'll definitely need solid CO2. I'd think in 75G tank you'd be looking for around 4 or 5 bps, but that varies widely with regulator, circulation, reactor efficiency, etc. If you have a 4dKH solution you should be shooting for greenish yellowish, just watch fish for surface gasping. Personally I don't trust pH monitors as they use tank water which has phosphates and other buffers that tend to skew pH reading as they relate to CO2. There will be a sweet spot somewhere so that plants are pearling and fish are happy. You'll also need to dose NPK, dry ferts are the least expensive and easy to use IMO. Check out the EI dosing system, it works good, although I back off of it a bit, just a preference. Most importantly: PATIENCE!
 
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