need help for my flowerhorns

[LOCO_LOCO]

i just got 3 flowerhornd, they aboute 2 to 4 inches big, and its been more than a week, they were very good, swiming all over the tank eating very well, but last two day they kind of got slowdown and now they just hidding on the buttom and they have white dust looking stops all over them, biggest one look like he is going to die soon,
what u guys things about this problem? what can be reason for it?
thanx

 

[LOCO_LOCO]

by the way i have some other fish ( bejewel, convict, white cichlid, pleco, jack dempsey) in the same tank they all good, juts my flowerhorns got like this.

 

[akskirmish]

Post your water parameters please-

 

[LOCO_LOCO]

its about 80 degree

 

[LOCO_LOCO]

if u mean size its 50 galon

 

[Onion01]

pH? Ammonia, nitrite, nitrate?

 

[LOCO_LOCO]

i dont know that. is there any tools for that i can buy?

 

[akskirmish]

Fresh water test kit-Should beable to find at n e Local fish store...

Very important in keeping fish to own one of these...

Other than posting your water params-
We will need to see some pics to try and determine what you are talking about...

 

[LOCO_LOCO]

here the some pictures, this the best i can take.
thanx for help

 

[Oni Angel-Hannya]

Poor fish,its badly infested with ich it looks like.Add some aquarium salt to the tank and change 10% of the water every hour.Also,type in "ich" in the search bar here.