I have a trio of wild caught A. gephyra who used to do quite well but lately became very timid. They used to breed almost continuously but lately I've seen eggs from time to time but no freeswimming fry. They don't show any obvious signs of disease, their fins are not clamped but they do show the shaded body color that I usually see in scared/sick fish.
One particular thing happened to the aquarium, because of lack of space the tank became too crowded with fry and water quality deteriorated. I noticed at a point when fry actually had died, I removed the fry then and did a water change but I have the feeling that ever since the fish behave differently. This happened more than two months ago.
Water values:
pH = 6
KH = 0
Nitrite = 0
55 μS
24 degrees Celcius
This is the aquarium, the light looks bright on the picture but it's a 3W saving bulb. The aquarium measures 60x40x25 cm and they share it with three ember tetra's and one N. eques.
Any idea what could be going on?
Thanks!!
One particular thing happened to the aquarium, because of lack of space the tank became too crowded with fry and water quality deteriorated. I noticed at a point when fry actually had died, I removed the fry then and did a water change but I have the feeling that ever since the fish behave differently. This happened more than two months ago.
Water values:
pH = 6
KH = 0
Nitrite = 0
55 μS
24 degrees Celcius
This is the aquarium, the light looks bright on the picture but it's a 3W saving bulb. The aquarium measures 60x40x25 cm and they share it with three ember tetra's and one N. eques.

Any idea what could be going on?
Thanks!!