[/QUOTE We are just estimating size of the tank based on the known size of the oase filter right next to it in the picture. To my eye it looks like around a 1 kg tank? The regulator on it looks like it is single stage as well?
A 430 Liter (or 113 gallon) tank should go through 1 kg of co2 in about a month, maybe less. And if that is a single stage regulator then when the pressure in the co2 cylinder drops to a certain level all the gas left in the tank will rush into your aquarium in a very short period of time. This is one of the common ways people gas their fish/shrimp to death. It can be avoided by using a 2 stage regulator. Your other co2 tank looks like a 5 kg model? This is a good size for the the 430 liter tank and you should definitely plan on using that right away.[/QUOTE]
Not sure if the regulator is dual stage or not it was about 250$ AUD so hope so...
And not sure what size the small tank is i will deffs be buying a bigger one soon though.. the big one is 13kg or something i think so I can use it to refill the small one with the right attatchement...the shop down the road didn't have the size in between which is the 5/6kg thats perfect hence why i got the massive one