12-21-2006, 01:45 AM
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I have to agree, chemicals are not the answer here. You mentioned that there have been algae blooms in the past... that means something is causing them to happen repeatedly. You can't fix something if you don't know what's broken. The best approach, especially since the fish look good, are to get water params for ammonia, nitrite, nitrate, pH, and Phosphate. Have "the petco dude" write down exact numbers. I agree with what the others said about petco dudes knowing squat, and also that this is likely a nitrate/phosphate issue. Does the tank get any direct sunlight during the day? How long since you changed your lightbulbs? How long is the light on the aquarium in a 24 hr period? Once we can identify the cause, we can help you to fix it so it doesn't come back again. The other info we need is what fish are in the tank... species and how many of each, tank size, maintenance schedule, and feeding routines. The more you can tell us the faster and easier it is for us to help you.