Thanks for the reply. I didn't see it until today because I only just now figured out that one needs to click on next or page 2 to see more replies! No wonder I'm having trouble here if I can't even figure out how to navigate a message board!
Well, coincidentally I just finished reading in my reference book that carbon shouldn't be necessary in a filter on an ongoing basis and you've just confirmed that. So, if it weren't for the fact that I already opened and used a few tablespoons of the large container of Aqua De-Tox charcoal I bought I would return it. It claims to remove "disease-causing viral microbes" which it further claims are a "constant threat to the health and well-being of every fish in your aquarium." It also claims to have "specially developed resins that continually eliminate ammonia without using harmful chemicals." And finally, it claims to remove "harmful toxins and heavy metals." These "heavy metals are present in most water supplies" and can "stress fish to the point of death." So I suppose it's a miracle that the fish in your tank are alive at all, let alone "happy, healthy, and spawning"!
SO, since I do have this huge container of this stuff, I may as well use it. It says to replace it every 4-6 weeks. While I understand that it's not necessary, it won't be harmful will it?
As for the Liquid Gravel-Vac. It's not supposed to take the place of vacuuming the gravel. It's supposed to break up the gunk that builds up in the gravel so it can be more easily and effectively vacuumed. The salesperson said that since I haven't yet vacuumed the gravel (the tank is nearly 8 weeks old) that a lot of gunk has built up. He said when it builds up like that then you get large chunks that will not be suctioned out---they'll just float around as you vacuum no matter how much you try to get them out. Having never vacuumed, I had no way of knowing whether or not this is true. The salesperson said to use this stuff three days in a row, then again on Friday, and then I think he said to wait a few days before finally vacuuming--- to give it time to work. . . .