How long would the CO2 tank last... Well depends on how much you are looking to induce, and also people normally use a 5-10lb can of Co2, commonly used for beer taps. Secondly, in order to do multiple setup's it can be expensive. Normally gang valves, metal/plastic haven't been effective for myself on multiple setups. I use needlvalves on each tank. Which can be expensive on top of the regulator and bottle. The refilling of the bottle is the low cost, a 5lb can would probablly last you 2-3 months at normal rates, and only cost ~$7-10 to get it refilled. Hope this helps ya out- if ya get questions give me a yell! Mike Chappell www.threeguysaquatics.com Mike Chappell- Owner -----Original Message----- From: owner-apisto@admin.listbox.com [mailto:owner-apisto@admin.listbox.com]On Behalf Of Gary V. Friedlund Sent: Tuesday, October 09, 2001 3:17 PM To: 'apisto@listbox.com' Subject: RE: General Fishroom Questions > 5 - How big of a CO2 tank would be needed to run maybe 5 of the 30 gal > tanks and how often would it need to be replaced? Can't answer this one. Try the plant list? Can someone direct me to the plant list? Jason ------------------------------------------------------------------------- This is the apistogramma mailing list, apisto@listbox.com. For instructions on how to subscribe or unsubscribe or get help, email apisto-request@listbox.com. ------------------------------------------------------------------------- This is the apistogramma mailing list, apisto@listbox.com. For instructions on how to subscribe or unsubscribe or get help, email apisto-request@listbox.com.