Lilly leaves deteriorating
Hello, hopefully somebody can help me figure out what is going on with my tank.
I started a 5 gallon hex a month or so ago with a few stargrass stems and a cheap lilly bulb from walmart. At first the lilly absolutely exploded, doubling in size weekly and sending new leaves to the surface almost daily.
Next thing I knew the stems on a few of the leaves began disinegrating and pretty soon brown splotches were forming/spreading/consuming the leaves. Now nearly every leaf is affected and I have resorted to keeping the light off to hopefully halt (or at least stall) whatever is happening.
Prior to this I was dosing the tank on an EI routine with excel. I used fluval stratum for the substrate and I can't say exactly how many wpg the tank was getting, but I know that it was probably med-high.
I tried dosing more GH booster thinking that it might be a Calcium deficiency (I noticed a few of the newer leaves were misshapen) but that didn't appear to help.
The stargrass, though it never showed as robust growth as the lilly, doesn't seem to be affected.
Any advice would be great, I know it wasn't an expensive plant but it is going to drive me nuts if I don't figure out what went wrong!