Way to go to bump a 12 year old thread. Who knows if that tank is even still used. Or any of the posters still active. It is safe to assume that either
do you still have these shrimp available mr.catfish?
I can't tell you much that plantbrain hasn't said except I had the same problem and it was due to the sudden removal of CO2 which I've been using for
Go with one school! 20g high tanks are small in regard to depth and width. This does, however, give you a great chance to show off a few species of fish
Awesome!!! Sounds like it is going okay.