Oh yeah, these guys eat and eat. The little leo took a little longer to acclimate than the other two, but she's making up for lost time now.
I change water on a daily, or every other day basis right now, as that tank is small and the bioload was less before these guys got this tank. Not to mention the mess they make is substantial and I don't like looking at it.
They're my first rays to date, and I spend tons of time in front of this tank. Way awesome.
zek