Picking up on your several questions in the last few posts...
Algae increasing is due primarily to light. It is a very simple equation/balance issue. Plants need light of sufficient intensity balanced by all nutrients in order to photosynthesize, and when this occurs algae doesn't have a chance to become problematical. Some algae will always be present,k it is natural; but excess we can avoid.
Increasing all the nutrients to balance the light is one way to go, but I prefer the opposite; lower the light intensity to balance the nutrients. My first priority is the fish, and knowing they will be better under less light, I start out with the light that will achieve decent plant growth and nothing more, then I add nutrients to balance. There is no formula for this because every aquarium is different due to the source water (hard minerals), fish load and feeding, and plant species.
In my opinion a dual T5 HO light fixture is simply far too much light over any tank that does not have CO2 diffusion. And the CO2 is far different from the liquid carbon additives. The fact that not all plants respond to the liquids says it all.
There are several dual T8 fixtures available, Drs. Foster & Smith have some and so do other sites. I have two 48-inch T8 tubes over my 5-foot 115g tank and I still have to control the light duration to keep algae at bay.
