Sick Guppies And Neon Tetras In 30 Gallon Tank.

Recently I have noticed that some of my fancy guppy's fins were torn, One of my neon tetras appears to have torn fins and very faint spots that don't appear to be ich. Another one of my guppies has been staying near the bottom of the tank and has white poop. Last weak I lost a pleco, he had a white spot on him that grew, I posted about it on the forum but nobody helped me until later. My water parameters are nitrite:0ppm, ammonia: 0ppm and nitrate is 0ppm. A few days ago I did 2 doses of erythromycin but I ran out. Please help.

 

Neons are not usually fin nippers but they will nip fins if the school is small so if you can increase there numbers. As for the Guppy the white poop is parasites and as long as you keep the water clean the issue should subside quickly.

 

The usual problems are poor water quality which gives an opportunity for Columnaris bacteria.

Fish can of course already have these problems when purchased.

Normally in a cycled tank nitrates will be present and it is best to keep them below 40ppm (ideally 20ppm) with water changes.

Water changes with tap water that has a low nitrate level will reduce the elevated levels in the aquarium.

 

The tank is cycled, I have had the guppies for a few weeks and the neon since august. There are 7 neons in the tank. I also do weekly water changed. Aside from my normal water change that I am doing today what else can I do?

 

I'm not sure because I've never had a cycled tank that had no ammonia and no nitrates. I don't think that is possible actually. How did you cycle the tank?

Ammonia can seem to be zero because of the insensitivity of the test but ammonia must be present if there are living fish in the tank because fish produce it 24/7.

But if the above is true nitrate will not be zero because most of the ammonia present is converted into nitrate in amounts measurable by the test.

Are you using API test kit?

 

Maybe not zero but It, but it is low. I have had this tank for almost a year, there are currently two filters in it. A HOB and a sponge filter. And I do use an API test kit.

 

Ok, so I treated the tank with API general cure and the guppy seemed to be doing better for a day but he is sitting on the bottom of the tank.