Although ammonia is a normal metabolite excreted though the gills of a lobster, it can become toxic when it reaches high levels in the tank. Ammonia test kits may be purchased to monitor the level and then appropriate measures may be taken to control it. As previously mentioned, a biological filter may be used to detoxify ammonia by turning it first into nitrite and then nitrate which is less toxic to lobsters. The pH level should be kept at 6.5-8.5. Maintaining a proper pH level should not be a problem with an adequate buffer in the filter.
Pesticides Never store or use pesticides in the same room where lobsters are held.
Lobsters are very sensitive to insecticides. Signs of insecticide poisoning in lobsters are hyperactivity followed by tetany, a condition characterized by muscle spasms.