hi, thank you for your reply and sorry for my lack of info.
The aquarium is a 60 litre tank.
I retrofitted 2x23w 6500K energy savers for a total of 46w @ 6500k.
The substrate is normal sand, not fertilized. I add liquid fertilizer once a week.
I am not adding any co2, but i do plan on making one of those yeast sugar diy co2 things down the line.
The plants have grown a lot of new leaves and i also checked the roots and they have grown a lot also.
The hygrophila were almost purple when i first got them. The leaves now have either started to turn green or else fallen off, but i really do not think they are dying, i think they are adapting to the new enviornment, or al least that is what it seems like.
The filtration is a standard internal filter with the pump set on high. I have no idea what my water params are but i have angels, neon tetras and a pleco which are all doing well.