Mike - that's my strategy and history as well. I had DIY rocks that leached too much phosphate. The result was HA in extreme excess all over. The cleanup with GFO and algae scrubber/DSB worked too well and crashed the HA vey quickly.
The end result was exposed rock with no algae and few nutrients. Without the natural plankton that comes with real LR (I had seeded some - they never got the dinos), it was a perfect space for the dino takeover.
I went dark, slow UV and heavy skimming till clean. That gave my coralline time to form and reduce the available real estate for dinos.
So far, so good
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