guppies tail?

Question

i have a 90L tank with a variety of tropical fish: small knife fish, small elephant nose, a couple of gourami, tetra and two guppies.

One of my 2 remaining guppies (he recently survived a minor tank disaster when i killed all the bacteria) is slowly loosing his tail.. it looks like its being eaten???

All my other fish seem happy.. and the other guppy looks ok not sure whats going on.. Is there anything i can do to help him survive?

:)
ps. we also have ok pH/ ammonia/nitrate/nitrite

any advice?

thanks i will try that.. will they require a heater i have an old beta bowl

Answer 1

It sounds like your guppy has fin rot. This can have either a bacterial or fungal cause. See the descriptions on this webpage to determine which is the cause and how to treat this. A quarantine tank would be a good idea, because your knife and elephant nose won't care for copper medications if you need to use these.
http://www.fishdeals.com/fish_diseases/fin_rot/

Speaking of the knife and elephant nose - it's not a great idea to keep these fish in the same tank - both give off an electrical field to navigate and feed and their signals will confuse each other's.
http://members.tripod.com/~Boeing_Dude/knife.html

Answer 2

Male guppies get their tails nipped by other fish. As I have just found out. My red eye tetra will not leave my guppies alone, but if I tap on the tank when a red eye goes near a guppy, the red eye swims away. I am trying reinforcement techniques. So far its working, which also shows that fish have a longer memory than 3 seconds.

Answer 3

First of all, you have a knife and elephant nose with guppies? And Gourami? Wow, that is not a really good combination there. First of all separate your sick guppy from the other fish, keep it heated to about 80 degrees F and add 1cc of salt per litre. Perhaps some methylene blue or a broad spectrum anti-biotic to assist with any secondary infections.

Answer 4

Go to a professional Fish Specialist.
Tropical Fish Are sontimes very very aggressive at times,and can bite others if they feel threatend.

Some colors may not be liked by some fish as well,like a threat.

So Try to Call a Specialist....usally they are more than welcome to answer your question.

PS For now,try and find a small tank,or little fish bowl,and separate the guppies from the other ones.