Once all the contaminant is cleaned, is there any way the BioCritters could seek an alternate food source and degrade more than they were intended to?
No. BioCritters are formulated to degrade specific contaminants and nothing else. The amount of BioCritters used is based on the estimation of the quantity of contaminant. Once the contaminant is cleaned, the BioCritters’ food source is gone and they become inert. If there were another spill, the inert BioCritters would automatically revive.