Discolored plant leaves

[mrseigel]

I noticed my hygrophila corymbosa leaves started to become discolored. What could be casing this?

 

[CaptainBarnicles5 3]

Hello I'm no expert in plants but it does look to be indicating a nutrient deficiency of sorts...what fertiliser do you use?

 

[Colin_T]

magnesium or calcium deficiency perhaps. Maybe @StevenF will have a better idea. pretty sure he's our plant guy.