Hi, i am new to this forum and relatively new to fishkeeping too.
Well basically today i discovered one of my neon tetra's has a white patch on its back, it doesn't like look a spot or lump, but is ever so slightly raised. The patch is too big from what i have seen in photo's to be ich.
Now some background information, tank was set up about 2 months ago, and after a few weeks of running empty, 6 neon tetra's were put in, 4 died from a nitrite spike, caused be overfeeding, and so two remained. Then the tank was left a few weeks to settle down, 2 remaining tetra's really perked up. Then a siamese fighting fish was introduced aswell as 2 shrimp. No problems, couple of weeks later siamese turns aggress and is in its own tank. Then 2 more weeks and 7 neon tetra's were added so they would all school. This was last saturday(28/06). All have been doing fine, until today, when i noticed the patch on one of the 2 remaining from the first lot.
Tank was had last water change yesterday(saturday 4/07) and about a third was changed. Water was tested, there were hardly any recognizable amounts of ammonia, nitrite and nitrate. No CO2 is put into the water. Currently using a fluval 200 plus filter and has a flurescant tube for lighting. tank is only about 12 gallons.
oh and there was some chasing going on for a few days after the 7 neons were introduced and there was some this morning aswell
hope someone can help.