On Apr 11, 7:22 pm, "Tippi" wrote:
We got 3 koi angelfish recently. When I feed them they would fairly
leap out of the water for the flakes. However now one of them is
sometimes found hiding under the filter. When it's not hiding and I
drop the flakes in, it will come up to half an inch of the flakes,
then just look at it. Tried dried blood worms, it took just a nibble.
Tried thawed frozen worms, it swallowed one, spat it out, and repeated
that a couple of times, finally rejecting it. What could be the
problem and what can I try next? thanks...

This could be many things.

First, what are your water parameters?

*Ammonia 0
*Nitrites 0
* Nitrates under 50
*pH (this can vary, I have found more problems caused by rapid changes
than with the actuall pH)
* KH (usually 50-80 for angels)
*Gh (usually over 100 for electrolytes and calcium).

You may have an internal trematode or Hexamita, for this Metronidazole
(best fed in foods for FW) is very effective or even a combination of
Metronidazole and Kanamycin.
A 30 minute bath in Methylene Blue at double strength may be helpful
too (we used this a lot in our service business)
And finally I have found some success with Usnic acid too as a natural
treatment for similar symtoms.

Here is a site about medications (much more info about Metronidazole
and Methylene Blue and more) and one about Trematodes:
http://www.americanaquariumproducts....edication.html
http://aquarium-answers.blogspot.com...s-in-fish.html

Carl