Anubias Developing Brown Spots Then Holes. Advice Please

[marieukxx]

I have an anubias plant at the front of my small 21L tank. It's been in there since mid october. It's developed some brown spots on the bigger older leaves that eventually turn into holes. My lighting is a long tube that says on it. 6W 10000K and I've been having this on for 8 hours a day.

I can't use ferts because when I used tropiflora my african dwarf frog became ill and died. Any suggestions what's wrong with it. Is there too much light?

Here is a pic:

 

[marieukxx]

Anybody have any ideas?

 

[FishFanatic04]

Pinholes can be a potassium deficiency. It can also be a co2 deficiency if your lighting is high enough.

Try lowering how long ur lights are on if u can't try ferts

 

[m_attt]

all those plants in the picture look like the have nutrient deficiency's, someone must know a fert that is safe with them. What about making your own?