newbie to discus need advice

[sinner_209]

first thing first water parameters is
ph 7.2
kh 3
gh 3
ammonia 0
nitrite 0
nitrate 10
bare bottom tank clay pot planted amazon sword with driftwood and flame moss and java moss
problem important having is there are 6 Julie discus various strains one goes from very dark to grey and half of them have black stripes i feed 4-5 times daily with glass worms blood worms beef heart and marine/terra flake/beefheart flake mix i have a small hob filter until the larger one is fully cycled I've also noticed one is quite a bit more aggressive then the others do they just need to find there pecking order or could there be a different problem thank.you all in advance

[discuspaul]

What size are the discus, how long have you had them, what size of tank are they in, and what type of filter are you using (how small) ?