My 20L was just looking like a jungle and the plants started losing it's beauty. I used root tabs and supplements. I figured it was time to change the substrate. I've been wanting to do a dirt tank for some time now. And I figured the plants need more room to grow. I was able to find some awesome deals and decided to do a 40B dirt tank. I still haven't finished moving all the plants over yet, but this is how it looks right now.