I'm going back to gravel for a number of reasons, mainly because I have a group of fish who are under the impression that there is an excavation project going on in my tank. Plus the sound of sand in the impellers of my AC110's is slowly driving me insane. So what I plan on doing is using a couple of 30 gallon rubbermaid containers to hold my fish while I switch the substrate. So I guess my question is should I expect an ammonia spike since I'm removing the BB that had built up in the sand or should the Biomax in the filters be enough to keep things stress free?