[edschueth]

Anyone know what deficiency causes glosso leaves to turn yellow (looks as though they are dying). I do diy co2, dry ferts with excel on occasion and have 72 watts (T5) over a 20 long. It grew great to begin and started to carpet but since its growth has slowed and now several leaves are turning yellow. Thanks.

 

[Darkblade48]

It may be a macronutrient deficiency. You mention that you are dosing dry fertilizers, but how much, and how often?

 

[timwag2001]

iron is the first thing that came to my mind

 

[edschueth]

Here is what I am dosing:

2ml Plantex CSB 3x a wk
roughly 1/16 tsp KNO3, KH2PO4 & K2S04 3x wk
occassionally excel