Air Pump/Stone?

My air stones aren't putting out very many bubbles. Two very small streams at the most. I tried both my stones (both are used), one output nothing, the other very little. Putting just the hose in the reservoir produced bubbles, so it's not my air pump right? Do I just need to buy a new stone? How long before this will be a serious problem for my plants? Thanks

Yeah you need to get some working stones in there right away. Get 2 as large as will fit, 12 inch if possible, and get the kind that are all stone rather than a slab of stone inlaid in plastic.