Double Sponge Filter vs. Single Sponge?
I was wondering what experience you guys have single sponge vs. double sponge filters? I'm going to purchase one for my fry/quarantine tank, and couldn't find anything online that explained the difference. I know a double can't use an airstone, but a single can- what does an airstone do for a tank? I've heard it makes it less noisy... but I'm not sure.
Just basic pros and cons would be great.