I'm using it in my 55 and I love it! I have the 20-40 and it is a little fine and you have to be careful to not vacuum too deep and siphon it out during water changes. I really like how the fine grains look though, so I don't know if I would prefer the bigger stuff or not. My Corys love sifting through it, and they've gotten darker and seem more active than when I had gravel. It hasn't damaged their barbels at all.
I didn't clean mine and didn't have any problems but some of the grains floated to the top of the tank and I had to net them out. I don't know why they did, but I would do a quick rinse in a bucket to get rid of floating grains and just for the peace of mind.
Overall, I highly recommend it.
Last edited by ac0xr; 05-26-2015 at 02:43 AM.