Hey, my brother buys Catalina water. He lives in Los Angeles. Any experience with Catalina water, anyone? He always ends up with some new benefitial critter in his tank. I've been taking care of my tank for a while but even when I recently seeded my display with fiji rocks, no critters. Sorry. Didn't mean to hijack.
I've seen those Instant Ocean buckets. Good thing you only had a problem with a layer of it. I usually buy the bags. Maybe I should try what one of our friends do here which is get a large trash bin and mix salt water there and keep it running as a reservoir so you just scoop water from there during your water change.
Good luck with your Instant Ocean!
We live and we learn