Anyone ever mix the regular Flourite with Flourite Dark or Black? I have some of the regular now, but wanted something darker for a cap when I tear down to add MTS. I wanted to go all black, I just don't want to spend the money for 2 new bags of Flourite, so I thought I could keep some of what I have now, and mix in one bag of darker one. This would also be nice for keeping some more beneficial bacteria in the tank. I'm just afraid of how it will look. Anyone tried any mixes that included the regular Flourite?