Yes. It has a carbon filter and heater. I had the tank for 3 weeks and used bio stuff and tap water treatment. The shop tested the water and I had slight amonia so I waited a week and they retested and it was ok. I have my own test kit now and it’s been really high. I’ve done 50% water change last 4 days but there was still some amonia. Poor chap didn’t stand a chance! I’ve removed him and done 50% water change but not sure what to do. Some people say to put food in the tank to cycle it but not sure.