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Cheers guys, I'll be using a nano diffuser as the tank (Fluval Spec) has a built in filter. Might look into modifying the powerhead and position the diffuser underneath but we shall see!

You can get the tanks much cheaper than that, near £5 each here http://pages.ebay.com/link/?nav=item.view&alt=web&id=231324691814&globalID=EBAY-GB - assuming these would fit. Think I'll get a proper reg with solenoid and the soda stream adapter. How long do these last? Thanks Sent from my...

Thanks for the replies all, I've just been reading the thread about soda streams and could be a good idea. The tank is tiny, only 19l so not too worried about the cost, can't go the FE route due to no room for the canister. Sent from my iPhone using Tapatalk

Hi all, I'm looking at getting a regulator for a disposable 88g tank and seen this http://pages.ebay.com/link/?nav=item.view&alt=web&id=221779812864&globalID=EBAY-GB would I need a needle valve for this? The seller states that I do not, but not sure how accurate that is. You can get...

I guess this is similar to buying off te shelf ferts vs EI salts, you're basically paying for water vs actual product. I might look into this when mine runs out, I've still got a quarter of AE's version.

I always assumed that you use these externally, surely nobody actually had that monstrosity inside their tanks?! Tempted to get one and make it watertigh

good to hear you got it sorted out. It's usually best to put your CO2 1-2 hours before lights on as it means the plants have lots of CO2 straight away, and off 1 hour before lights off so they can use the remaining gas, aiding your O2 levels for the dark period :thumbup:

They're fine, put them in front of your outlet to distribute

Bear in mind it'll probably have a negative impact on your filter bacteria due to decreased O2 levels. A few people seem to do it this way without any ill effects though but I personally wouldn't. What system are you using? If its a decent reg you could get an inline diffuser

Remember all that Nitrosifying and Nitrifying bacteria in your filter needs oxygen to function. By pumping it full of CO2 this would probably decrease the effectiveness of the nitrification process. It isn't to the extent that you'll see major issues, but it may also effect the filters life...

You need a fair amount of pressure to run inline diffusers, which yeast simply cannot do!

Usually that's how you adjust the working pressure of the reg, so it sounds like yours will be able run higher than 1.5

I wouldn't say they're just for larger tanks; they can dissolve co2 and distribute it round your tank more effectively, and also its one less thing inside the tank.

Plus you'll have adjustable pressure, so you can use an inline diffuser. What makes that particular model better than yours? I'm just about to order one

Just out of interest; which seller did you use? I notice aquariumHK and AAS sell very similar units, but unsure which one to go for myself

Aquatics direct, aqua essentials, and all pond solutions on eBay sell them.

I've found these http://cgi.ebay.co.uk/CO2-1KG-REFIL-Gas ... 3a6789a110 Would these fit standard regs though?