Actually, you CAN have too much beneficial bacteria, especially early on in the process, when the bacteria has a sudden growth spurt, on account of the nourishment it suddenly finds itself in.
This is where we can get a bacterial 'bloom', a sort-of slightly milky appearance to the water.
This is harmless and usually dissipates of its own accord.
Asking the question, I'm wondering why ask? Is it because things are not moving fast enough for you? Bear in mind that fishkeeping and impatience don't mix well and setting up a tank can b a great exercise in cultivating the necessary patience you'll need to be successful in keeping letting your creatures thrive.
I suppose that the manufacturers have spent some considerable times in their labs to ascertain the optimal doses for tank and bacterial health and I'm happy to go along with their expertise, dosing as per instructions on the bottle.
Thinking about it, if you have too much bacteria and there isn't enough for them to feed on, what do we think might happen?
On
@Jan Cavalieri 's post, remember that whilst your bacteria does live in your filter, it will also live on
every available surface in the tank.