Hi all! First, what a forum! I've been lurking for a few days and the info on here is amazing! Anyway, I havenâ€™t kept fish in around 15 years (I'm not 'that' old, I just started young ) and now want to set up a well-planted tank. I have the tank - it's a Fluval Venezia 350 litre corner tank. I plan to use injected CO2 with a fire extinguisher - probably go for the aquamagic reg and solenoid. I intend to run a Hydor 300 external heater plumbed into the external filter. Substrate is likely to by ADA Amazonia, unless I'm persuaded I should try something else. I'm not sure about how to administer the CO2. Do I go for an aquamas reactor like this: http://cgi.ebay.co.uk/ws/eBayISAPI.dll? ... 0266431318 or do I go for a Rhinox diffuser like this: http://www.aquaessentials.co.uk/index.p ... ts_id=1431 Will the Rhinox 5000 diffuser handle a 350 litre tank? Advice appreciated, Thanks.