Just a little observation from my tank.... I had lots of algae which was really building up on a watchable basis- the reason was I was giving it just over 2WPG, lots of CO2 based on a potted, and very selective reading of Tom's advice, looking at what I wanted to hear and not the bigger picture, but not dosing any ferts beside the Sera Floredepot substrate layer....
So once I'd been shown the error of my ways I did this: turned off CO2 (it needs to get the faulty solenoid replaced so will have to go for a few days anyway), pulled out some algae, and went down to 18W of mucky looking Juwel tube lighting.
I can't day the algae is gone, but it has stopped growing like a good un!
So luckily I managed to get hold of a box full of PMDD ingredients, and hopefully when the CO2 comes back we'll be in business.... Nice one!