11-30-2007, 06:46 PM
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Well, it depends.
The 40 gallon will be easier to maintain certain parameters, but the water changes will be a BEEATCH to keep up on. Although if you set up a sump, and stuff chaeto in it AFTER your tank cycles, you may not need to do a water change for a while since the chaeto will use the nitrates.
The 10 gallon will be much, much cheaper to start out with imo. Consider that depending on where you are, (I'm in Canada) live rock may cost upwards of 7 or 8 dollars. Mine cost me $7.50/lb.
Stocking a 40 gallon tank would amount to around $350.00 - $400.00. That's only for the live rock - not to mention the live sand, etc..
edit - also, considering that you have a FW setup, you'll need to upgrade your lighting to either T5s, or MH. Your current lights WILL NOT sustain your tank.