I've kept crab in my community for some time no. but would now like to start a true crab tank! I have a 24"x12"x12" tank. i plan to have some water, brackish and some beach and stony aria too. thng is i dont know how to do the split between the water and land i will use a 3g per ltr brackish mix. unless people have other ideas. things like heating and filteraton. are crabs like Crayfish in not being bothered by nitrates, so needing only rare water changes and topping up for evaporation? the water and the filter media will come from my community tank. any help?