Who Gives A Fish Forums

Thanks for the tips, everyone. I'll try the DIY rock and mix my own salt. Currently using Red Sea Blue Bucket, but it's pricey.

My corals aren't thriving like they used to, and I'm trying to cut costs without sacrificing quality. What's the cheapest way to keep them healthy? I've got a 40-gallon tank with Zoanthids, a few LPS, and a basic LED light. Parameters are stable, but growth is slow.