I suspect agression and not a disease. What do you think. One of my platys is staying in a corner mostly and using my return pipe as a source of protection. part of his body at the mid-section appears to have missing scales. It is also a female. It could be from too much agression and pursuit from another platy as I have noticed this. But I cannot discount my Betta or my Dwarf gourami or Honey gourami as it may be territorial agression after the lights go out. The tank is a 75 gallon and it also contains 9 Platys, 6 albino cats, 1 Redeye tetra and 1 neon tetra. I am preparing a 1 gallon tank (formery the betta tank) to remove the either the sick fish or the one suspected of attacking and place it there.
I think it is aggression from the betta, get the betta out of there be for he kills the gouramis.
I must say that the combo of fish you have is not good, on a couple of scores. First, you have shoaling fish (the various tetra) which need a group or they will be stressed and this frequently makes them aggressive and more likely to nip and bother other fish, out of sheer frustration. A group of at least 6 of each species is recommended. But be careful if you have a small tank with insufficient space.
Second problem is keeping sedate fish like gourami and Betta in with more active fish, this too can cause increased aggression.
Third you have soft water fish (the tetra, gourami) in with harder water fish (platy) so someone is not going to be happy, and this too can cause aggression.
Aggression is one of the fish's few ways to "fight" against stress from these and other issues that are foreign to the species. Stress also weakens fish, causing increased health problems. You can read more here:
I'll remove the Betta and place him back in the one gallon tank. The Tetra's and the Gourami's will go back to the fishstore. I really like the Gourami's as much as the Platy's but this aggression which is my fault due to their differant needs, requires me to make a choice and I picked the Platy's. Thanks for that article Byron, I printed it out.
Do you know if you have soft or hard water? That might be a better way to decide on who should go.
My tapwater is 7 dGH. But I raised it to 9 to accomodate the Platys. They are more colorful and active then the Gouramis. So I will be sticking with hardwater fish.
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