i only got 3. only one real "main" tank though. the other is at my dads, the other is a 10 gallon that is mostly a grow out for now, but will be my fiances tank once they grow.
idk how people have so many tanks. but then again (no offense), most of the people with a bajillion tanks... the tanks all look like **** lol. they usually have a nice (rare) fish, but bare bottom, no background, and algae everywhere.