[Tree]

how long have you had them in the tank? is it a new tank that was just set up? Plants can melt as they try to adjust to the water. Let's hope it's just that and nothing too serious. ^^

 

[Tree]

Hmmm... then you might need some pant food for them? 20 days should have been enough for the plants to recover.
I use this kind of food for my plants: LINK though I might be getting this for mine cause I have an all natural planted tank. LINK

EDIT: didn't see you said you added the seachem flourish tabs in the tank! LOL never mind the links then. =P is there a limit on how much to put in the tank?

 

[Tree]

Hmm I'm sorry I can't help ya. =( but I hope someone else can. T^T