Angel Fish Question

[glolite]

Hi guys
 
I've been keeping fish for over 10 years now and have recently started what I hope will be an angel fish breeding program. Started with a cycled 50 gallon tall tank 48l x 15w x 18h which had been running for 2 years with sajica cichlids grown from fry. I moved the sajicas into my 350 litre corner tank where they seem very happy.

  Purchased 4 baby angels the same day and acclimatised them as usual. One died a week later but my water stats were fine and I always do my water changes.
 
Anyway, the three remaining angels have been fine now for three weeks but only one is growing. He/she has doubled in size already. the other two don't seem to eat. Has anyone kept angels from babies who can give some welcome advice please?
 
I am feeding them on small tetra flake am and baby brine shrimp pm. Filters are 1 eheim ecco external and 1 large sponge filter. Plenty of sword fern and cabomba established in the tank.
 
Thanks in advance.

 

[fluttermoth]

How big are your water changes and what's your nitrate level?
 
Oh, and what type of angel are they?

 

[glolite]

I do 25% water changes weekly. My nitrate levels are around 30 same as our tap water. Ph is a bit high at 8 but we are in a chalky area for water. I have 1 adult angel in a different tank who's been with me for over a year now. The new ones are koi angels, silvery orange.

 

[fluttermoth]

I would definitely up your water changes, to at least 50% weekly.
 
A lot of fish excrete hormones into the water that stunt their growth, once they reach a certain concentration, so large water changes are essential for growing fish.

 

[glolite]

Ok thanks, Ill try that.