Go with the extra pillow stuffing. Any way you can reduce surface agitation will prevent unnecessary C02 drive off.
Liquid carbon can be a little pricey as tank size increases (I wouldn't use it for anything bigger than what you got), but as a temporary fix until you have read up on and can afford a C02 system it may not be a bad idea. Its worked for me in controlling algae and promoting plant growth early on.
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Don't strive for perfection initially, but do enough research so you feel comfortable with your choices. Don't trust chain pet stores, and do your own research!
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10 gallon open top betta bachelor pad.
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