Need help ASAP

[TheAquascaper]

Picked up a few Discus today for my ADA planter tank, didn’t realise my CO2 was through the roof, I’ve switched it off for now, but how long will it take to gas off a 300 litre tank? I’ve raised lily pipes to create a lot of surface agitation and put the discus in a small bare tank with a hang on filter till it’s safe?

TIA

 

[Colin_T]

put an airstone in the tank and let it aerate vigorously for 30 minutes and you should be fine. If you don't have an airstone then creating surface turbulence with power filters will take a couple of hours.

 

[Fin & Feather]

And if you have a sand substrate, stir sections of it to release trapped gas pockets from decomposing plant matter, food and fish waste that is buried in the sand. It (the gas) will rise to the surface and be dispersed into the air.
Because gravel doesn't compact as tightly as sand there is less chance of gas build up, unless there is a layer of waste.