It could work depending the size of rtc and size of the ray when you get it. If you do want to try get a large adult ray I say 10"-18" at time of purchase. It also depends if your rtc is aggressive. Mine wasn't so they lived peacefully.
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Ok, I doubt I will risk it but my RTC is very gentle so far so I think it would be fine, I just don't want to risk it.
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