Finally I have succes with HC, and a few of red plants, like althernantera and I has rotala macandra (die by my fault) I tried rotala walichii like 3, 4 times and I cant grow it, I use ferts, good light, Pressurised CO2, and all and still it not grow and die. I have a friend that have it growing in 10G tank and he only have good light and CO2, maybe flourish dose. I think that it was a lack of mg, and Ca because I dont dose with these in the past, I have Ca and Mg dry ferts now. Also I dont make a lot of w/c. Maybe the plants uses almost all the Ca and Mg in the water column and it doesnt help stem plants. I also have crypts but the feed form the rich bottom substrate (red clay mixed with mineralized soil) so they dont show lack of nutrients. Now Im dosing with CaCL, MgSO4, Plantex, K2H2PO4, K2SO4, KNO3. Maybe I change from CaCl and MgSO4 to Grumpy GH booster. pH: below 7 maybe 6.5. CO2, 3bps