I'm not sure of all of the kinds of plants I have in the tank, most of them were from a bulb package from Petco. But I have 2 moss balls, 3 bamboo stalks, a ivy plant and 4 other types ( don't know what they are).

My ivy's roots are turing really dark and almost mushy. They weren't like that when they were in a vase or when I transplanted them to a small betta tank.

I also have bamboo plants, they aren't growing roots very fast. Are they slow growers or am I doing something wrong?

The "ivy" is also worrysome, since there aren't really many true aquatic plants that resemble terrestrial ivy.  Can you snap a picture of it?  It's very possible that this is a terrestrial plant that was sold as an aquatic - this happens a lot in some fish stores.  That would explain its rapid decline, since most land plants can't handle water.  They just drown.

Pictures of your other plants would help a great deal.  Like I mentioned when I replied to your other topic, all plants have different needs.  Some are higher-maintenance than others, so I can't really give broad advice when their requirements are so variable.  If you can't get a picture, either of your own tank or from something like a Google search, a detailed description of each plant would be really helpful.

Hopefully that will shed some light on the situation.