Thanks bro free form, initially the pg wasnt in the tank, it was in the bottom teir, then i transfered the pg up and took pictures of it. After 2 days, i felt that the tank was abit cramp for all those fishes, so i transfered all the discus to be with the st's in the bottom teir. Now my current tank is the aro, rays and tig. Btw, Bio-home plus rocks, it really helped my filter, else before that when i had only those 3 rays, i had to change water like every 2 days, now just once or twice a week. I can see the difference in my fish health before i used bio-home plus and after..
thanks for the info bro. would love to see your tank in person. hahahaha.