Your tank sounds like my pre San Diego experience. I am willing to try other frags especially with colonies as old as yours. I am frustrated as I currently am watching an Idaho grape and orange monti do what all my other caps have done. Look good for a few days, get a brown film on them, fade out and die. I could grow those with my eyes closed and no testing in the past. It just seems weird my maintenance is soooooo much better here with weekly water changes, weekly testing, biopellets etc only to have everything die.