My 4 month old (teacup)stingray is currently in 55gal. Preparing to set up my 125gal. Right now I plan on using a sealife systems pro 300 with overflow , built in protein skimmer. Plan on using bioballs and ?. For substrate would like to use 100 pounds of play sand and 80lbs of treated sand. Is the filter enough to add 1 more stingray, and is the playsand from lowes ok if cleaned properly.Any advice would be greatly appreciated. Thank You