The salwater cleaner wrasse just recently passed the mirror test. Great read in this article.....There is a fascinating test called 'The Mirror Test' that can be used to see how self aware and animal is. Some species can tell they're looking at themselves when they see their reflection, but most can't. It's not a perfect test for many reasons, especially since many animals don't have eyes that work in a way that they can focus on a reflection, but It's still very interesting when an animal clearly passes or doesn't pass. I don't think there is anything we tend to keep in aquariums that passes the mirror test unless you have a tank large enough for a dolphin! I'm afraid it's a lot more likely a fish chooses it's mate and who to school with based on instinct honed over millenniums of evolution, not self awareness.
But google 'Mirror test' sometime, it'll bring up great videos of animials like dolphins, great apes and corvids being adorably clever and self aware. Also human babies, since the ability to recognize our own reflections is part of a child's mental development!
I don't think it causes more reflection so much as a warped reflection, like a fun-house mirror.