03-30-2013, 08:48 PM
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I know you're frustrated, but I'm just trying to help. I have experience with some of those plants, but not all. How are they doing badly? I'm not sure any of them grow fast enough in low tech for you to see a total stop in growth.
The 12 hours lights on sounds like a lot to me. I don't even do that long with the tanks that aren't planted. In that long you're likely to have the plants use up whatever CO2 occurs naturally, at which point they will stop growing and the algae will.
Is the water sprite floating? That will help as well. So will lots and lots more fast growing plants. An entire surface of floating plants is your best bad though. They can get CO2 from the air and shade the rest of the tank for you. Try a bunch and see which works the best and grows the fastest. For me that's Amazon frogbit. With a surface of that you can leave the lights on longer. However with a surface of that you might not be able to keep stems. You shouldn't have algae though.
Definitely up the ferts without the thick surface covering. I know lots of people will dose that amount here on the forum. They have low light and hence need less ferts. Not the case with you. If you want to dose based on PMDD that is 6 ml a day. Want EI instead? That's 32 ml once or twice a week. A dosing routine will help.