Water change = money
Electricity = money
Fish food = money
Top-off water = money
I'm sure you've spent at least $1 out of these over a year and a half. =P
Negatory, I mountain bike so my hobby money goes to that these days (or at least it was until my kid started into the hobby too). You just have to be smart about it, prepare to insert foot into mouth...
I used to have a single 14 gallon bio-cube when I first started. I spent close to $200 a month on frags, and salt and this that and the other thing. When it came time to upgrade, I thought, there has to be a cheaper way to do this (that and the wife was getting ****** as I was spending a lot on my other hobby). I sold some frags and used cash from my fish fund jar and picked up a 2x4 hydro tray ($30) and built an LED fixture from scrap material and some LEDs I got on ebay ($30). I re-used my project desk as a stand for the hydro tray, piped it into a sump I got in a trade to tie the biocube and it together. here's a pic of the biocube before I took it down (gave it to my sister to get her rolling)
Here is my breakdown:
Selling Frag Packs = as the wife calls it: fish fund money - This goes towards utilities (I use a watt stopper and pay a flat rate towards the water bill), piping/fittings, new led diodes for retrofitting traded fixtures, net pots, egg crate.
Trading Frag Packs = store credit, which gets me new corals, fish food and salt.
Trading LED Fixture Work/Consulting = More frags, Store Credit, fish, hermits.
Trading Frags = Equipment, Live Rock (LED fixtures, hydor wave makers, pumps, second hand skimmers- picked up an 800XR)My 6 Gallon display: Fluval Edge was also from a trade, display before that was a 90 cube picked up from a trade.
Free Stuff = Picked up 4 Buckhorn Shipping containers from a local grower for freesies, air-welded the cracks using scrap from the containers, used 4" pvc scrap to re-inforce to prevent the problem that led to me geting them for free from happening again. Used locally scavenged extruded acrylic for covers. Trade for other aquired equipment or use money from the fish fund. Conduit, scrap out of the metal bins from job sites. Temperature controllers - pulled from HVAC retrofits, material that was destined for the scrap heap. PVC Scrap from dumpsters on job sites.
Here is my system (minus my 6 gallon display in the house):
