ok so no to batrays maybe someother stingray but i got this fooo!!!! ama have a badass filteration a 54gallon sump full of live rock, &live sand! aand then am going to have another pump that will just flow the water mind you all of these pumps am talking about are 2,000gallon gph. i just need marine salt. i decided not to get my new xbox and spend it on my fish. it was the hardest choice of my life. i just want to get the Marine Salt cheap. and for water changes i think ill do it 2twice a month? kill me if am wrong. ill take out 200gallons and then add 200gallons of salt back in witch will cost me 50.00 bucks each time but i dont mind spendin $$$. any tips/advise are welcomed