10-28-2011, 04:46 PM
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At a guess, the guppy tank is overstocked!
Stocking levels of a tank can be tough to figure out and it's part art. First, are the water parameters good? If they are and the water quality stays good, then from a water quality standpoint, the tank's not overstocked.
Next, what type of fish do you have, how large will they grow, how "dirty" are they, how much "room" do they need to not feel stressed? Here is where the art comes in. Some fish, the territorial ones in particular, will need more room to establish territories. Otherwise, constant fighting or stress will result. Other species may be more tolerant of crowding, it will depend on the species. Is there a magic formula? I don't think so.
I don't think your 55 is overstocked, but what's in there?