Quote:
Originally Posted by
grant778 http:///t/396843/putting-in-a-sand-substrate/20#post_3535820
I already removed a third of it but next time I will just push it over. When I push it over though wouldn't that cause a spike because when I end up removing it all wouldn't I be removing 2 thirds of the old substrate at once?
Hi,
Just watch the tank for ammonia, if none shows up...you have no problems...I would have some change water on hand while I swapped out the CC...just in case an emergency water change is needed.
The good bacteria is on the open surfaces...rock, sand, even your power heads, decorations and filter materials, very little is actually in the water at all. We replace the filter media to not only capture and remove large yuck from the tank, but we do it
often enough to prevent the colonies from getting too comfortable on it...otherwise when we remove it for new clean material, we cause an imbalance.
Removing the substrate is also removing colonies of good bacteria. So ideally you want to give the good bacteria guys the chance to rebuild on the new sand substrate, at the same time as the CC is being removed..
LOL...Todays lesson:
The fish tank is in a balance...the poop and waste is counter acted by the good bacteria, they are in equal numbers....but there can only be enough good bacteria to feed on the amount of waste produced, once an equal balance is reached, the good bacteria guys can't feed and build anymore.... Adding a new fish produces more waste, and the colonies of good bacteria must populate and build more to compensate. That's why we add fish slow, so the tank can adjust to the new waste levels...if you remove their colonies that is built on the substrate, filters and rocks, then the waste is more then the good bacteria, and ammonia spikes are the result.
So to change the substrate from CC to live sand...you have to add and remove it slow, the tank needs time to rebalance and keep your SW critters safe from ammonia spikes.