Hi. I set up a small tank for my daughter. 5 gallon hex tank with a box filter. In the tank we had a Betta, 2 corys, and 4 X-ray Tetras. After about a month or so the 4 Tetras died suddenly. They started having difficulty swimming and staying upright. One by one the died. After a few weeks I tried again. I added 6 neon tetras. After a day or so the fish started to display the same symptoms as the X-ray Tetras. 3 died. In the first two days. I kept doing partial water changes and adding stress coat. This seems to have solved the problem as the other 3 tetras are now acting normal again. The Betta and Corys seemed unphased by all of this. Any idea what happened?
A five gallon tank is pretty small for the number and size of fish you have in it. What kind of filter do you have in it?
Not to mention, if you added all the fish at once to a brand new tank, you didn't allow time for chemical cycle that takes place in all fish tanks to get going. Some fish are more succeptable to these normal chemical cycles than others.
Any time you start up a new aquarium you should only add a couple of fish initially, the larger the size of the fish, the fewer you should add. If you add all the fish at once, there can be a sudden and massive toxic buildup of waste chemicals naturally produced by fish, namely ammonia and nitrites. But once the tank has been existing long enoguh for 'beneficial bacteria' to have gained a foothold, the bacteria will convert those poisons into the nitrates, which are far less dangerous. This is why water testing is recommended, because you'd know what those dangerous chemical levels are.
Having a planted aquarium lesses the effects of these poisons If the newest fish survived the latest scare, you should be in safe waters from here on out. Just don't add any new fish.
***Edited By: Minniyar on 8/1/2008 9:18:30 AM*** Reason: clarification
Never trust a tall dwarf... he's lying about something.
Everything in the last post are very true. You should increase the amount of life or load on the tank slowly. The one thing I would add and find to be a common mistake of new hobbiest is over feeding. Although the fish look very hungry and will eat all day if allowed you will polute their environment very fast if done. Parents of young children should stress the importance of this or take on this part themselves.
could also be water temp changes should stay between 70-74 degrees is ideal.to cool or too hot could pick them off fast. (do you float your new fish in the bag in your tank first for about 10 min or so -so thAt the temp isnt shocking to them? and NEVER add the water you get the fish in may cause a disease in your tank. net them out gently.also when you change the water do no more than 1/3 of the tank at one cleaning then wait a week for it to balance again-alsonever use the warm water tap-alot of metals ect could kill fish-if you dont let the water your going to add sit over night then get dechlor drops it will instantly remove all of the hard chemicals such as chlorine-etc I realize you have a small tank and probably didnt want to go all out but a 10 or even a 20gal would be easier to maintain it biologically adjusts better in the long run-and ditto on all the previous advise.
I keep it there when I want to slow down the breeding soon as it hits 74 my fish go nuts. My community tank consists of about 45 fancytails (the different styles) laiyr tail some spade some large fans and some almost black bodied. an albino cory some kind of slver sardine looking algea eater-(dont care for him) got to be 5inches and I was told they only get to be 2 they were slightly off. and I have 1 lemon tip 2 white and 1 orange tetra.recently lost my 5 year old beta , I havent had to add any new fish for the last 10 years. Its a 30 gal.