Buying used has saved me a bunch, craigslist especially, I know living in florida (and those in so cal get great deals too) plays a big factor on the ease of finding cheap aqaurium supplies. I got a 55g for 30 bucks, my first 55g came with stand,lights, and filter for 60, I bought a 150 for 200 with a stand, got 2 ac70s for $25 total off CL,magnum 350 for $30, 2 300 watt heaters off ebay for a total of $25, you get my drift, be smart, look around, buy used if possible. Youll save money. Ive spent less on everything I own than some poeple pay starting up a decent 55g. As For fish,many people have their own grow out tanks so they buy little fish that are cheap that would be expensive if larger, and some sell/trade their grown fish for other grown fish when the time comes