I have: a 20 long, two 20s (one divided), three 10s (one divided), a 40, plus numerous 3 gallons and under for bettas.
I suggest, for having bigger tanks especially, getting a "python hose" which in petsmart they have one like it, AND IT WILL SAVE YOUR ARMS FROM BUCKETS!! =D Yesterday I moved a total of.... I duno....over 200 gallons BY MYSELF x.x by bucket. a 3 gallon bucket. Do the math for the trips! =D
Anyways, cycling tanks SAVES you from doing massive water changes. Quarantine tanks are your best friends.
You do a divided tank (say...a 40 long, divided into 4) you want those quarantines to keep all of them healthy and disease free.
umm..... kijiji, craigslist, second hand stores, word of mouth... those too are your best friends
=D I got many of my tanks...most of my tanks...second hand. Found in someone's pile of trash on the curb behind my house, with two huge filter systems, the second hand store was awesome for under 10 dollars usually WITH a heater, second hand under 60, or sometimes free...
Vinegar and hot hot water for the second hand stuff works wonders.