Need a reef expert....

[i have crabs]

i dont know of any but there are companys that will test up ur water and give you the results, if your water turns out to be really bad maybe look into buying a water storage bin and buying water, ufa and other places sell water bins for anysize so maybe get something that holds 500g and get a truck to fill it maybe, sounds expencive but i doubt its that bad really, i bought a ufa bin that holds 100g for $200,