Help on algae ID

[nemonlizzy]

I have some questions concerning some algae that was diagnosed by Bob Fenner as "Peyssonnelia". I have a similar looking algae as the person on your site does here,

http://www.wetwebmedia.com/redalgcompfaqs.htm

on 8/22/07

I have considered dinoflagellates as a possibility, however I am not all together sure.

Either way here are the things I know about;

It's first sign of existence is the whiting out and dying off of coraline algae. Then you will start noticing dead snails around the tank as they eat the algae and it kills them. Then all other algae in the system dies off as this algae will out-compete even chaeto. It is dark brown at its base and is very filamentous from its base up. It is hairy yet it encrusts. The hair on it in one of my systems is easily 1/2 inch long. I have tried killing it with a saltwater/2(HO) mix and that doesn't even kill it. The ONLY way I have found to kill this algae is through lack of light over many days, an by many I mean almost 14 days. I have attached some pictures.