Was there any ammonia reading over 0?
Sounds like you may have made it without a mini-cycle....with that crowd you are going to have to do water changes to keep up with those nitrates however.....I would suggest doing 50% change any time it tests as high as 20...it might be a couple times a week.....
I change mine any time it is over 10....seems to keep the stress down in my tanks.
Isn't it the way it goes...you got a used tank, then had to get another one for the fish you inherited.....oh well sounds like fun to me!
