Ive set up a new tropical fish tank with neons guppies mollies and 2 othersand there all dying with in 1week?

i have tested the ph of the water it is normal heater is set at 27* C lights are on bout 10 hours a day i feed them every morning


the tank and all equipment were purchased from petstock store including the fish (which have cost $200.00 plus in 4 weeks) any help would be great as im at a loss of what it might be????????????

Ive set up a new tropical fish tank with neons guppies mollies and 2 othersand there all dying with in 1week?
Ceci %26amp; Wii have it right.





The most likely explanation is ammonia. All fish excrete it (as does uneaten fish food) and it poisons aquatic animals very quickly.





An established tank has a lot of bacteria in it that break up the ammonia into(first) nitrite and then nitrate which are much less poisonous. (Google "nitrogen cycle" aquarium).





Fixing the problem.





Firstly, check that that ammonia is is the problem. You need to test both ammonia and Nitrate. An "ammonia alert" button is also not a bad investment.





On the off chance that you do have an infection, as all of your fish are dead do a 100% water change and sterilize the tank with boiling water. (This is the last time you should ever have to do this.) Make sure the glass does not heat up too rapidly or it will crack.





Growing new bacteria.





The substrate on the tank bottom and filter media are all important as growing space for these ammonia-munching bacteria, however can not do their job until they have had time to be fully colonised.





You can buy bacteria in a bottle, however I have never been particularly convinced. To get a head start ask you should ask a friend for some of their gravel from an established, healthy tank. Add one small fish to your tank and feed generously.





If you don't know anyone, go back to the idiot that sold you that volume of fish for a brand new tank and tell them you want some.





This will allow the bacteria to start to grow (they need the ammonia from the fish and uneaten food to live on whilst they colonise).





This process is called "cycling" and will take at least 4 weeks. Even then you may get ammonia spikes, so monitor carefully, feed in moderation and add only a few fish at a time.
Reply:I suspect NEW TANK SYNDROME if your threw all your fish into the tank new without cycling it first. (and I don't mean letting it run empty for however long -- I mean growing a stable bacteria colony to process the Nitrogen Cycle -- look it up if you're not sure what I mean, or ask about it here... it's extremely important to a healthy, successful fishtank.)





It means, in short, that they're all dying of ammonia poisoning. Burned gills and internal organs, and usually oxygen deprivation as a side effect.
Reply:for fish that cost that much shouldn't the place you purchased them make sure you do this tank in the proper way?
Reply:You need to have a living water plant in the tank and a decent amount of light so that bacteria can be created. Let the tank go without fish and just the plant for a couple of days. This is also a must! you need to have a small sucker fish that sucks bacteria to eat the waste of the other fish. Trust me... it will help keep the tank more clean too. If it's tropical fish in the tank you might want to make sure you have salt water otherwise the fish will die for sure haha... just by the dumbest chance you didn't know that. Also the tank might not be big enough for the amount of fish you have... if you have more then 3 fish you need a decent size tank.


Hope I helped.


-Kev
Reply:most probably is there is insufficient air:


no aip pump or water plants 4 photosynthesis


overcrowded


too little food


the water is not suitable(poison from some rocks...salt-water...fresh water...)
Reply:you dont say how big the tank is but that is alot of fish to add at one time, you checked your ph but did you test your ammonia, you cant just throw fish in water and expect them to live. please research before you purchase, also neons and guppies have different water requirements.
Reply:find some one who has a fish tank for a while and take some of their water it has bacteria that what fish need or go buy some stuff at the fish store they should know the name of it, after that just slide you finger tip in the inside of tank if it is slimy your tank should be ok....
Reply:The fish were probably diseased. I've bought 1 fish and has killed fish I've had for years. Need to isolate and medicate them. I use Melafix. Just go by the directions.