New gourami attacks older ones
I have added a second female to my gourami pair (Trichogaster trichopterus, Blue Gourami). It is still considerably smaller than the two adult fish. Today I noticed that the old female has bloody sores, and I observed that the new female actually molests and threatens her. She also attacked the Pearl Gouramis.
this raises the suspicion that it possibly is not a female but a juvenile male!
Should I treat them, and if yes, how?
In case of open injuries, a mild anti-bacterial treatment (liquid sera baktopur) makes sense as to avoid secondary infections. Good water hygiene provided, such injuries heal quickly and without remaining traces, making a further treatment unnecessary. In case the attacks do not become less it may become necessary to put the new fish into separate tank before serious injuries or even losses occur.
Dr. Bodo Schnell