Pretty sure cross posting across several forums isn't a good idea.
http://www.plantedtank.net/forums/general-planted-tank-discussion/94157-plants-food.html
Just to let you know though, dry fertilizers work fine for our purposes and should not affect the water parameters significantly. In addition, as mentioned, you do not need to aim for "perfect" water conditions for Discus. There is nothing wrong with keeping them at (say) a pH of 7.0.
http://www.plantedtank.net/forums/general-planted-tank-discussion/94157-plants-food.html
Just to let you know though, dry fertilizers work fine for our purposes and should not affect the water parameters significantly. In addition, as mentioned, you do not need to aim for "perfect" water conditions for Discus. There is nothing wrong with keeping them at (say) a pH of 7.0.