wow I missed a lot~
Thanks everyone for the info and the pictures :)
I can see if I can find some rocks around campus, maybe take some from near the pond, and they definitely need to be sanitized. There's a joke that you can catch diseases just from touching the water, let alone swimming in it.
I'm not sure if there is a rule about the limit of tanks, whether they have to add up to 10, or if the biggest can be a 10, but I currently don't have room on my desk for a printer, let alone my laptop if I wanted to -.-
The two tanks plus some small supplies have taken over xD