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Does glutaraldehyde have a shelf life. I found some a the bottom of a box of aquarium junk that's likely 4 or 5 years old and am wondering whether it's worth using?

In the short term I'm contemplating something like Liquid Carbon. I've not seen it discussed whether you need to keep an eye on GH/KH/pH in the same way you do with CO2 injection, so am I right in assuming you don't? And is it easy(ish) to get the same red colouration of plants with the such...

Can anyone tell me how litres of (Sodastream) CO2 equates with kg (for fire extinguishers)?

Ages ago I put an air stone in my (non CO2) tank when some of my fish got sick, in the hope that increased O2 would help them recover. I've never got round to taking it out. Although I know there are other reasons for my plants not doing as well as they could (and I will be making some other...

Paintball CO2 tanks are, as far as I can tell, about the most compact way to have a pressurised system. But They're going to need filling reasonably often. So here's a thought ... If you've got room in a garage for a larger cylinder but not under your aquarium, how about having both and filling...

I know pressurised CO2 is better than yeast or any of the liquid carbon souces. Please don't anyone suggest using it. I wouldn't be asking this question if it was an option. Right, got that out of the way ... My initial planting in my new low tech set up has not gone well (see my journal if in...

I'm thinking more seriously about preasurised CO2. I was expecting to have the return pipe from the filter at the top of the tank and I'd like to use an inline atomiser/diffuser (so all the plumbing is out of sight and in the cupboard, not the tank). Because the tank is 2'6" high, will there be...

Are there any short, fat CO2 bottles? Something like 2kg that's about 18" including the reg? (From what I can see, FEs are too tall to fit under my tank and welding bottles too small to use without running out too quickly.)