Hystrix rays get up to 16" across...not much turning room in a tank that is only 18" wide.
Wouldn't it make more sense to get a 180 gal now, rather than getting a 135 gal and then upgrading? Or do you already have the 135?
Either way, I wouldn't get a ray until you actually get the 180, much less 2.
Type "estes marine sand" into google to find estes sand.
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