you need an ammonia test kit
a nitrite test kit
and a larger tank




"Owesport" wrote in message
oups.com...
On May 4, 4:19 pm, ~Mr. McDonald~
wrote:
Be nice to know a lot more info on the setup......size, water
parameters, filteraton, were all fish placed in the tank at same
time, etc etc etc....thats a pretty agressive type tank.

On 4 May 2007 13:15:13 -0700, Owesport wrote:

I hve had about 5 different oscars in my tank. Initially there were 3
oscars and 3 jack dempseys and 1 pleco. All of the oscars have died,
incuding the replacement 2 I bought to equal 5. I pleco has died but
I
replaced it. The dempseys have lived. Do you think that the dempseys
are killing the other fish?

-------
I forgot more about ponds and koi than I'll ever know!

Initially, it was a 10 gallon tank with 1 oscar and 1 jack Dempsey and
a Pleco. Then I added 2 more Jack Dempseys.
Then I added 2 more oscars. The pleco died. I bought a new pleco. Then
I bought a 20 gallon tank. Two oscars died. I added a tinfoil barb. I
added a electric blue cichlid. I added a irredsecent shark. The shark
died 1st night, Then Oscar was doing well for about a month. No
deaths. then he died and I bought another oscar. It just died a week
later. Dempseys good. Pleco good. and tinfoil barb good. blue cichlid
good. Then I added a yellow african cichlid and that is were we stand.
I have a 20 gallon and a 10 gallon filtration device (Whisperors) and
a heater. I do water changes 1 a week.