https://home.comcast.net/~jason-roni/tiger.html

Hopefully the video works.

They like to swim almost vertically (facing up, not down) into the current of my filter. Is this normal? I did a quick search and came up empty. They also like to rub against the roman columns. If it matters, I just changed my tank to sand yesterday, and I don't recall if they did this before (they did rub against things though). No nitrItes, little NitrAtes, no ammonia. It's a 28 gallon that is cycled.

Thanks!
Jason