I have been stricken with staghorn algae and have been fighting it for ages, but it just keeps on coming back so fast! Now I have what the family calls “nuclear” staghorn which I think might be ricca. Both kinds look the same, but the “nuclear” kind is a vivid bright green, so I am not sure what I have.
Anyway was loosing the battle, pulled out a lot of hair grass trying to remove it all and decided, after six months, that my T5 HO’s [4 x 54 watts] just don’t have sufficient penetrating power to reach the 2.5 feet to the bottom of the tank. So out came the Dymax [2 x150watts MH’s] and now have those on for two hours [initially] a day as well as the T5’s to see if that helps.
The MH’s have an intensity that drives the light almost like sunlight, they force plants to “colour up”. So here what 516 Watts does to Cryptocoryne undulata:
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