Shogunblue24
Fish Fanatic
Noticed someone selling a rena air 300 cheap locally and just wondered whether it's something I should consider for my new larger tank. What exactly do they do?
the only thing i use one for is to power my sponge filter in a fry tank. they can be used for DIY CO2 and brine shrimp hatcheries etc.


I'm hoping to get a ehiem pro thermo 2324 and have lots of live plants. Literally hoping to create a biotope in a 180 litre juwel rio.
your gonna be looking at a CO2 canister system then i assume?