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in my tank i have one of those hollow rock/tree trunk things that hold filters, heaters and stuff
and on the side there is this grill/grid thing that sucks up the water(its pretty powerful) so i put my co2 canister to a tube with an airstone at the end right next to the grill. so im hoping that by the time it comes out the filter waterfall it will be dissolved, will it?

P.S. it seems that when i turn of my light my fish start gasp a lot and bottom dwellers go to the top trying to breath air. should i put in an airstone?


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