It's almost worth setting up a cheap rack if you're going with tubs. For just a few bucks you can through together a rack if you're at all handy. If you are going to set up flexwatt, thermometer, thermostat... It's just as easy to do it for a few tubs as it is for just one.

I understand that not everyone can do this but it's so nice to have an empty tub to put the thermometer in where the snake can't destroy it. Just take your readings from the empty tub and as long as everything is set up the same all the tubs readings will be the same. And cleaning day is a breeze. Just throw the snake in the next tub down and clean the top one.

Don't throw away your tank. I've had a few BPs that I switched over from tanks to tubs only to have to switch them back to tanks! It's clearly the exception, but it happens.