If your chaeto turned brown and died it could be that there wasn't enough food for it to grow. The same thing happened to me not long ago. I upgraded my lighting over my cpr refugiums to one 96 power compact @6700k and started to use julian sprung's plant grow. It didn't start any algae blooms in the tank but my chaeto grows faster than anyone's that i've seen thus far. Good luck
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90 gal with 55 gal sump dual 250 double ended hqi 14k geisseman, 33 gal prop tank geisseman 150 hqi 14500k,two cpr refugiums,P.M. calcuim reactor,tunze wavebox.
12 gal nano
55 gal freshwater planted/jaguar tank with sump, pc lighting, co2 
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