I have a tank that was previously fully cycled tank, which broke down prior to christmas, (powerhead stopped working) and I removed all fish to my other tank and left it just sitting there as I was too busy with christmas stuff/holidays/work etc to do anything about it.
I finally got around to having a look at the powerhead, pulled it apart, put it back together and its now operational again. I assume the bacteria will have died off though, i've done probably a 60-80% water change and left it just running for about 3 weeks now. I was inspecting it the other day and found it heavily populated with snails. Will they aid the cycling process at all?