Find that if you use a uv fillter system that has a high filtration rate this will remove the toxins and areate the water enough to help the little buggers stay well however you will need to ensure that the tank is big enough for them to gain enough exercise to remain healthy also.
you will find that a good pet shop that spcializes in marine fish and invertabrates will help you with the information you need.
Best of luck and happy lobbie keeping.
