The Exodons are about 3" and I have had them for about 2 years now. The Exos might work in there if they don't try to eat the scales or eyes of my Piranhas. Although I do have a Pleco and another fish plus 4 crabs, a Flower Shrimp and Ghost Shrimp in there with them.
I have no problems with plants in my Exodon tank and the big tank I have some problems. It would be best if I got a CO2 system.
Thanks everyone! The plants in the 40 breeder are growing like weeds. Then they get moved to my 75 gallon sump. The plants in my 40 breeder Exodon tank are 6"+ deep! The crabs and shrimp love hiding in there and my driftwood that I silconed to the bottom. And the last part about the Exodon tank that I really love to say is that it has been set up for 6 months now and guess how many times I had to scrape the glass or clean for algae? None! Absolutely zero times which I love. I can't say the same about my 180 gallon tank so far. That is a weekly affair lol!