ditto on all those questions by Ullopincrate. Thats a large tank, if your bio-load is significantly more than it was with your Africans, then everyone's theories of an ammonia spike would be correct.
If you have say 10 smaller africans and replace them with larger more messy fish, your tank will have a sudden surge in ammonia because the bacteria in your filters was only enough for the amount of the previous inhabitants.
There really isnt much you can do until you get a test kit and test for
Ammonia
Nitrite and Nitrate.
Get a PH test kit also.
Until then, water changes are all you can really do to keep the levels at non-toxic levels until your filters grow enough bacteria to cope with the new load.
I would be hesitant to put in any additives or medications at this point. It could do more harm than good and could mask what the true problem is.
If you have say 10 smaller africans and replace them with larger more messy fish, your tank will have a sudden surge in ammonia because the bacteria in your filters was only enough for the amount of the previous inhabitants.
There really isnt much you can do until you get a test kit and test for
Ammonia
Nitrite and Nitrate.
Get a PH test kit also.
Until then, water changes are all you can really do to keep the levels at non-toxic levels until your filters grow enough bacteria to cope with the new load.
I would be hesitant to put in any additives or medications at this point. It could do more harm than good and could mask what the true problem is.