I'd suck out some water in to a bucket, transfer the coral and crab into it. Using a stiff brush brush off all the algae from your live rock and get it real clean. Suck or scoop out all of that sand, I don't think you'll get the algae out of it and with a 10 gallon there cant be that much. Clean the algae off the pumps and heater in the sink and get everyting clean as new and re build. Stick new sand in, get a bag of live stuff and you can put it right in. Set your rock back up and do 5 gallons of new water, 5 gallons of old. You shouldnt need to re cycle if you you use the old rock, it will have the bacteria you need on it.
A tank that small overrun that much pretty much needs a total re boot.
Just the way I see it, you can battle that for years but even the nutrient spike by the algae dying will cause your nitrates to skyrocket which in turn will create new algea.
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