The Fluval filters can only produce bubbles when the top outlet is above water and the adjustable air inlet nozzle is opened. Producing oxygen is very important for a healthy tank and some agitation of the water's surface is also neccessary.
Not to get off topic, but you really shouldn't be adding the water that your fish came in (from your local fish store) to your aquarium.pcam86 said:ok thanks, P.S does it really make much of a difference if my filter is now submerged more under water and isn't producing as many bubbles now? It's just that since i've added new fish the extra water from the bags has gone over the air attachment for the filter. Does it matter?