Just wanted to update. The plants are doing very well now. Following Tom's advice as described in few posts above, I increased the fertilizer (CO2 is ~ 30ppm). Though algal bloom is also noticed but just brown and could easily be removed by regular wipes. Water change was not of much help in this regard. Few isolated but tougher green spots of algae also appear time to time but well under control.

By the way, I have bought Tetra Algae Control. I has Poly[(oxyethylene(dimethylimino)Ethylene(Dimethylimino) Ethylene Dichloride] as its active ingredient. They suggest to use 1ml/12 gallon water. However they are asking not to use in new aquarium (less than 3 monts old) and the one with shrimps etc. Any suggestions? I am considering this because last night, upon a close inspection, I observed green threads in bunches on some plants as well as on my drift wood. Though I have cleaned it manually, It is bound to re-appear. I have also reduce some decor (lava rock) as I though it was interfering with proper water flow.