I have five plus a pool.
2x29 gallon, one is my community display tank and the other is generally in storage; I used it to grow plants over the summer.
1x20 gallon, also generally in storage but I'm currently using it for growing out fry.
1x10 gallon, my betta tank.
1x5.5 gallon, my quarantine tank.
I also have a 100ish gallon blow up pool that I use for breeding fish over the summer.