So far I am using light blue because my father-in-law had a million of them out on his dirtbike track to mark the turns. So why bother buying some when there were perfectly good ones laying around everywhere.

I hate to say it but I think the algae build-up will the be same no matter what. The rescue I volunteered at had every color bucket you could ever imagine and the algae in them was the all the same every week.

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"You gotta help us, Doc. We've tried nothin' and we're all out of ideas!"