hmm lets see
my 30g and 50 hex were both free, my 10g was 6$ from walmart, 55g was 40$, my 125g was 245$ (with stand and hood)
lighting for all tanks: 60$
substrate: 20$
decorations/driftwood/plants: 100$ all tanks
hob filters: 10g 10$, 20g 15$, 60g 35$
canisters: magnum 350 free, self designed submerisbles 5$ for media
sump: 20$ for media
pumps: hydor l35 50$ back in 2002, ca 800 20$
fish? dunno maybe 100$ total for all tanks.
so for indoor that's 731$ for a 10g, a 30g, a 50g hex, a 55g, and a 125g. not bad.
pond:
liner and sub tarp: 100$
filter boxes: 40$
filter media: 60$
waterfall: free
plants (in water): 30$
plants (around the edge) 50$
pumps: 100$
uv: 50$
tubing/pvc: 50$
fish: 75$
above ground intex for quarantine or pond draining: 50$
so 605$ so far on the pond. it's 4800g.
alltogether 1336$ on fishes. less than a platform upgrade to my primary machine.