We have a fully cycled 20 gallon long community tank and added a vampire shrimp a week ago and he is eating and filtering plus changing the interior design of his cave. Usually I change 25% weekly and add Prime ( 7 panda corys, 11 glowlight tetra and 2 Honey Gouramis, Aqueon Quietflow 35, Airstone, Heavily planted ,driftwood and rock caves). To avoid excessive molting....I know temp and ph of new water have to be the same....should I do only 10% one one day and then another 15% the next day? . I got water conditioner for shrimp ...should I use this with prime together? Thanks in advance for your suggestions.