12 for me, but it will be 11 soon as one of my bettas is going to move into a divided 10 with another.
And then hopefully back up to 12 if my angel eggs hatch and I need to set up a growout tank.
My husband made me promise not to get anymore tanks. And not to put any tanks in the bedroom after we moved.
So now there are only 2 in the bedroom and HE bought me 2 55g tanks for our anniversary.
Unfortunately, we are just about out of room.
Oh wait, if you count my pools outside (1 for 2 Red Eared Sliders and 1 for lillies and gold fish) that takes me to 14!
My husband laughed when I told him there was a name for it, MTS. He said I might HAVE it, but he is the one suffering from it. Haha. He didn't have to buy me those big tanks.
55 - 4 angelfish (1 big, 3 small) divided
55 - 1 Oscar, 2 Plecos
29 - 2 breeding angels
20 - 10 neons, 1 otto
10 - guppies
10 - 2 betta females
10 - 1 betta female and 5 cories
10 - 1 betta female (soon to be 2) and 1 otto
10 - 1 pregnant female molly
2.5 - 5 white clouds
1 gallon jug - 1 female betta soon to move to a divided 10
Small plastic swimming pool - 2 RES
10 gallon flower pot - water lillies, goldfish, a few mollies I needed to get rid of but couldn't bring myself to flush. (there are probably more now

)
1 gallon hex IN the 29 with angel eggs on a slate in it (layed Friday) Keep your fingers crossed
BTW, I saw a little cartoon with stick figures illustrating MTS and wanted to show the hubby but I can't remember where it was. Anybody know what I am talking about and where I can find it?