I have a 26 gallon tank which had a fine gravel substrate and a 10 gallon bowfront (it's a bit more than 10g really) that had a mixture of pea gravel and fine gravel. After reading a lot about which types of substrate Cory Catfish like best, I decided to switch both tanks to playsand. I plan on keeping Cories in the 26g and will use the 10g to quarantine any new fish before I put them in. I know there's a debate about whether barbel wear is due to rough gravel or dirty water/substrate but I would love to see my Cories playing and digging in the sand and figured they would be happier this way.
I thought it'd be best to do the switch now rather than later when I've got a full load of fish, I just have some Neon Tetras right now. It took ages to change both tanks but after many hours and one very bad back later, it's finally done! I kept lots of gravel from the 26g and put it in some knee high stockings that I've put in both tanks to keep some of the beneficial bacteria that was lurking there.
There is a point to all this, sorry, I just wanted to explain a few things first! So my question is, how long do you think I should keep these "gravel sausages" in my tanks for?
Will the good bacteria eventually migrate to the new sand or was keeping some of the gravel unnecessary?
My Tetras have recovered from white spot and are looking really happy and healthy, thanks to everyone that helped me with this. I'm going to my LFS at the weekend to get some malaysian trumpet snails to stir up the sand and some Black Neons that I'll quarantine before adding to my main tank.
The best thing about switching substrates so far? Everything got a good clean, so no more pond snails! Woohoo! :D