The carpet is a haddoni, gray/green. Looks a lot like the one on DD last night.
Well I would really like more sand in the bigger tank, so I will get some and let it establish. What's a few more days? The rock in there is well established, coraline algae and all that. Seriously, two years in October it will be up. It is more established then the QT the nem is in now.
Sounds like more sand, then watch parameters.
I recently upgraded from a 90 to a 180 that I cracked the back glass. So now I have a 220.
I originally planned to move everything from my established 90/G to the new tank. After breaking the 180/G and going with the 220, things took longer than expected. So after removing the sand from my 90, I put it all in 5/G buckets. It was suppose to be in the new tank within 2 days. That didn't happen.
After only 3 weeks, the sand had fouled and became a toxic mess. When I stirred the sand, it was black underneath and the smell was herendous.
I ended up having to rinse and bleach the sand for days. I didn't want to trash it because it was premium aquatics Reef Flakes. I love this sand.
I took the time and did the nessesary work to keep my sand. It was like using brandnew sand out of a bag when I was done cleaning it. My advice to you would be to keep about 5-10 lbs, and rinse the rest and transfer it quickly.
It will seed the other sand in a few months. I'm a clean freak and my patience runs thin, so putting that nasty sand in my brandnew tank wasn't happening. I'll seed this sand shortly. Plenty of buddies around from local club and message board who have established sandbeds.
If you do plan on using all the old sand, just get it in quickly. Then let the dust cloud die, but run the system with felt filter socks to collect all the muck and silt.
Good luck!