When you stored the old rocks, did you have heavy waterflow throughtout the bucket? Did you do water changes for the rocks? If not, then it may very well be that the LR inhabitant has suffocated/died, and now showing up as cyano-bacteria (red/ green slime algae).
What about your sand? Was it the old batch, or did you replaced the sand? Could very well be die-offs in the LS as well that's contributing to the out-break.
So lots of water changes, lots of water flow, and if you have it, hook up/borrow a reactor and load it with GFO to help combat the high Phosphate load.
If the sand is the old batch, you may want to discard it all and start with new. Happened to me when we moved, too, lessons learned the hard way.
Good luck.
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