What size tank do you have your luteus and blue eye together and is there other pleco in there?I’ll answer the blue eye question - mine is an extremely aggressive fish and is the 2nd most aggressive Pleco I have owned. L234 is the most aggressive which would latch on to free swimming fish.
That being said the blue eye is aggressive and there will be fighting. In general, if your tank is big enough an armistice will occur but it could be after a lot of fighting and can result in another Pleco not doing so well along the way ( even death if the blue eye is the bigger fish and the tank does not provide separate territory.
Here’s a pick of my blue eye and luteus facing off.
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What size tank do you have your luteus and blue eye together and is there other pleco in there?