everyone that I have owned were only moderately active during the daytime, and extremely active at night. They eat same as most cats. I would suggest shrimp, krill for small ones, and blood worms. Silversides. worms, ect. Both that I have owned grew fast to 12" in about 9 or 10 months. Fairly cheap, one I found here in montana was $50, but I had one in NC I bought for $25. So location and how much your fish store wants to cheat you are important in price.