+1 Do not let your phosphates get high! Once that hair algae gets going it's a real battle to get rid of. It's a battle I lost in my old tank. I recommend a reactor with rowaphos from the very start.For a FOWLR tank I would test for phosphates as well as your regulars of pH, Ammonia, Nitrites and Nitrates. The reason being that high phosphates usually means that you will get more algae. If you can keep the phosphates lower that can help decrease the algae growth. Calcium isn't as necessary but testing it and keeping your levels within range can also help keep your pH at the right level.