Changing substrate in a cycled tank
I'm planning on changing the substrate of my tanks. I just want to change the gravel substrate for a different color. I'm sticking to gravel. What would be the best way to do it? if I replace all the substrate, I think the tank will loose a lot of beneficial bacteria as well, correct?
What do you suggest?
Fluval Edge 6gal, planted, 3 platies, 3 neon tetras, 1 cory panda.