[stlhokie]

You appear to be underdosing ferts by a significant amount. Tropica Specialized Nutrition appears to be fairly dilute in nature.

Your 1x weekly dose of Tropica Specialized Nutrition adds the following amounts of ferts to your tank:

Try to target the following each week for N,P, & K, starting on the low end and and ramping up as necessary.
N - 5-15 PPM
P - 3-5 PPM
K - 5-15 PPM
Mg - 5-15 PPM