A member (who's name i cant remember right now) conducted an experiment with this stuff using guppies in two seperate tanks, one treated with easy balance and the other maintained with weekly water changes.
The outcome was that the guppies in the tank treated with easy balance were smaller, bred less, had smaller broods of fry and suffered a higher mortality rate than the guppies in the tank maintained in the traditional way.
In short easy balance will keep fish alive for the stated period of time but they will not thrive like fish in a properly maintaned tank should.