HELP, fish dying fast

[tbrock]

i have a five gallon freshwater tank that until a couple days ago had 9 small fish. in the last couple days, 5 fish have died. it started witht eh algae sucker fish. for a couple days before it died, one of my other fish eemd weak and wasnt eating much, should i have gotten him out of there? this fish died at the same time as the algae sucker. i went and boutght a new alge sucker at the lfs. yesterday, my fish seemed fine, but today three have died so far, and it looks like the others wont live through the night. i dont know if there is much i can do for them, but does anyone have any input on what might have gone wrong? thanks for you advice

 

[XXFirefighter]

9 fish too much...
do a water change...

 

[Umberle]

....in other words sounds like ammonia poisoning

 

[Toirtis]

1. Is your tank fully cycled and mature? If not, I am guessing ammonia poisoning.

2. Over what period of time did you add these fish? If it was less than 4-6 weeks, I am guessing ammonia poisoning.

3. What sort of filtration do you have on your tank?

4. Just how big are these 9 fish? If they are all <2cm and will stay that way, then with proper cycling and filtration, your tank may just make it, otherwise, your tank is grossly over crowded.

 

[tbrock]

two of the fish left are definetly no larger than 2 cm, one might be three and the otehr is prolly between 2 and 3. i have had the tank for 3 months. i never had any big fish, none have been more than 4 cm, and i havnt had any that big for a couple months now. all fish have been very healthy lately and none have died for a while until now. it was cycled and al the fish were acclimted properly. the only thing i can think of was a long time ago one of my gold fish had ich, i have odne water changes since then and none of the otehr fish were ever effected by it. its been 2 months since this inciident and nothing has gone wrong. thanks for all the advise