I keep an l200 and a common black with my rays no problems, it's up to the individual fish, some aquire the taste for some coats and some don't, I've gotten rid of my bn pleco which I also thought would be the safest but was wrong. Keep an eye on whatever you go with and see what happens, you may get lucky and never have a problem. Just be prepared to remove a problem pleco if needed.
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I keep same combo, 7 L200 and one gibbiceps. Worked out great for 3 years now.