These lobsters have strong blue coloration but only when kept under good aquarium lighting. Compared to other freshwater lobsters we sell (actually crayfish) these are the most affordable. You can keep more than one blue lobster in an aquarium so long as they have space to form their own little territories. You can also keep them with fish but only if the fish is around the same size as the lobster otherwise the lobster may catch and eat it!
Blue lobsters are super easy to keep... they will eat sinking fish food and some leftovers in the aquarium. Try and keep the water cool.