Nope. Adding new live sand should not cause any uglies. It's possible it may spur a cyano bloom but not too likely.
IMO the key is to do it as cleanly as possible and not stir anything up. The trick will be adding the old sand back in.
Drain the tank , keep the old clean water , as much as you can. Drain it down to close to the bottom.
Catch the fish, pull out a piece of rock and put it in a bucket with the fish with a power head.
Pull your rock out and rinse it if you need to to get any funk off and put it in the new tank.
Put all the rock and new sand in the tank.
Put the old water back in the tank. And the fish.
Add some bottled bacteria. Done.
You can rise the heck outta the old sand and add it back in or just toss it.
IMO the key is to do it as cleanly as possible and not stir anything up. The trick will be adding the old sand back in.
Drain the tank , keep the old clean water , as much as you can. Drain it down to close to the bottom.
Catch the fish, pull out a piece of rock and put it in a bucket with the fish with a power head.
Pull your rock out and rinse it if you need to to get any funk off and put it in the new tank.
Put all the rock and new sand in the tank.
Put the old water back in the tank. And the fish.
Add some bottled bacteria. Done.
You can rise the heck outta the old sand and add it back in or just toss it.


