That’s a good call on tapering off the silica, thank you. I’ll taper off over the next week, and keep my fingers crossed.To be safe. I would try to pull back on the Silica slowly personally. You said you don't see diatoms, but they may be there, and if you pull back right away it may just result in dinos coming in to fill that void. Hopefully it's the rubble that fixed things, and stays fixed. If it works, I bet that company will make a fortune because thus far we have no other options besides UV, Silica, and blackout/peroxide which are only temporary for many/most I think. I'm like 1 full year or more into dino battle and I've tried everything lol.
I feel your pain when it comes to LCA. In my last tank, I had them for about seven months, and they just refused to go. In the end, I removed all of the sand, and just blew the rocks off every few days and did weekly water changes. I probably went on like that for another month or two, and then it was like a switch flicked, and one day they just didn’t grow back, and what remained faded away. That was at the seven month mark, and I was able to add sand back after another month. I couldn’t point to one thing in particular that worked, which is the annoying thing about LCA!
Good luck with your fight