Just a little thing I noticed. Nice pond and all (atleast it looks to be so far) but that rtc is over 2-3x the size of the arowana. The aro is going to be a feeder gold-fish for him if they're housed together. Please, get rid of one or the other, or, if you want to keep rtc's and aro's, get rid of the rtc, let the aro grow, then when the aro is bigger buy a baby rtc.