Depending on how bad it is, I personally would rip it down and rebuild. Sometimes the uphill battle to get back to the former glory is actually just a losing battle. Pull it all out into rubbermaids, pitch the substrate, scrub down the tank, rinse. Repeat. While all of your rock is in the tubs you can scrub the s*** out of them an demolish as much algae as possible without worrying about it spreading in your tank. Rinse Bam! Half the battle is done right there.
Put it all back together and get back on the track of good husbandry. Sometimes the reset button is the best option.
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