11-18-2006, 01:11 AM
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You should look into getting liquid test kits, preferrably the master test kits, to test for ammonia, nitrite, and nitrate. Those are vital numbers that determine the well-being of your tank.
How big is the Pleco? I hope you realize that the tank is too small for the Pleco and Bala shark, the can both get over a foot long. Bala sharks also do best in schools of at least 5, and to house a school of them, you would need a much bigger tank. I hope you plan on getting at least a 55 gallon.
As for the Pleco, it would be nice to have more information, especially your water parameters, and maybe a picture. Try cutting up some zucchini or cucumber, maybe he'll eat that.
How often do you do water changes and how much do you take out?