I have 3 Crypto. Wendtii Green that have been in my 29 gallon tank for 2-1/2 months. Some leaves are green, most have a brownish color. My fertilizer regimen seems good ; Nitrogen-10pm, Phos.-1ppm, Potassium-10 ml./week, Iron 8 ml./week, plus dosing micros. 50% water change/week. Lighting -Fluval3.0 @ 70% except for blue and cold white. CO2 @ 20%. Is it too much light?, Are the plants not fully acclimated yet? Too much water change? Is the pot causing it to be root bound and killing the plant?