I used to get pickle buckets from fire house subs. The pickle smell is a bitch to clean out and I think it messes up the pH until you actually get all the pickle stink out. Not sure if it's the same buckets, mine were 5 gallons and red. Light would get through the red and cause problems so you have to cover it up. Your probably better off paying a few dollars for clean blue buckets from Lowe's. I haven't covered them up and haven't had any problems with light getting through. I think they also have black buckets online would be even better.
The pickle buckets will work but might give you a few problems. Only do one per a bucket.