Front15 there are 4 or 5 of us in Corpus. You can stock your tank from the Jetties, and unless your getting water close, trust me it's just easier to mix your own. The red-tide, and other organics in the water can be filtered out, but it's more of a hassle then just getting an RO/DI system and a trash can or some buckets to mix it in. Most of the coloration around here is sediment in the water which can be filtered out I simply put a RO sediment filter on the end of a 1" or 3/4" piece of PVC and ran a pump through it to push water through. You can clear the water up that way, but would be worried about algea blooms. My HS had a sea water tank in class one year and we constantly battled green algea. You can get decorator crabs, peppermint shrimp and several other fish from the Port A jetties and transfer them back in a bait bucket. Heck I've even taken some to San Antonio.