All,

I have been running a few tanks pretty successfully. I have a 29 gallon (Excel) and a 20 gallon (Non-CO2). Both tanks have Lobelia Cardinalis (Cardinal Plant). The ones in the 29 gallon develop very chalky leaves, whereas the 20 gallon plants are growing very nicely and fully green. Any suggestions on the issue?

A photo...
http://pic50.picturetrail.com/VOL416.../334509560.jpg



My specifications:
29 Gallon
1x per week: 1/4 tsp Potassium Nitrate, 1/16 tsp Mono Potassium Phosphate, 1/8 tsp Potassium Sulfate, 1/2 tsp Calcium Sulfate, 1/4 tsp Magnesium Sulfate.
1x per week: 5ml of TMG
Daily: 2.5 ml of Excel (15ml @ water change)
75% water change 1x per week
65 Watts of PC Lighting (6 inches above water) + 8 hour photo period
Fluorite substrate

20 Gallon
About every 3 weeks: 1/4 tsp Potassium Nitrate, 1/16 tsp Mono Potassium Phosphate, 1/8 tsp Potassium Sulfate, 1/2 tsp Calcium Sulfate, 1/4 tsp Magnesium Sulfate.
1x per week: 2.5ml of TMG
Onyx Sand + Leonardite Substrate
36 Watts of PC Lighting + 8 hour photo period