I need stingray advice?

[aharley8930]

I have a 180 gallon freshwater aquarium. I want to keep a motoro stingray but have a few questions first. the first question is can they handle aquarium salt? i have it in mine to help with stresss since my tank is only a little over a month old. second question is do they have to have ro water? i know they like soft water and mine isnt soft since im using tap water. i know the pet store i am getting mine from keeps their stingrays are in tap water and keeps the ph at 7.0. i would use the pillow softeners but that would get quite exspeensive with how big my tank is. i want to keep my ph betwwen 6.6-6.8. i would like to know if that will be too high for the stingrays or too low for the community fish that i have in my aquarium now. i just dont want to shock the stingray if i use ro water and keep my water levels completely different than the pet stores water levels. i also wanted to know if a motoro could even live in a 180 gallon aquarium. any advice is appreciated. thanks