Well I seldom start a thread but I know some here are fighting a problem with the plague of Bryopsis algae and I held off posting anything until I actually saw results. I have tried every know algaecide and remedy out there over the last 4 months fighting this green monster called Bryopsis Penneta that we had taking over this tank from last fall until April when I was a little more able to do battle with it. A list of what was tried follows and I tried every trick and idea I had ever heard or knew of.. 1. was to jack Ph to 9.0 average for about 6 weeks from Oct to Dec 07 and wet skimmed like crazy did nothing at all 2. Jacked the Magnesium from 1400 to 3,700 ppm used Mag Chloride for a month used Epsom salts for a month and then Kent's tech M for about month from Dec 07 till spring 08 did nothing still wet skimming like crazy again Nothing at all. 3. replaced all the system's water to get mag levels back to 1700 ppm about a 400 gal water change over a two week period then let it work for a few weeks that did nothing. 4. tried an algaecide called Marine algae Fix I think it was ? Did nothing 5 ran tank light less also while treating with the Algae Fix for a couple of weeks. This looked like it killed it out but soon to realize it was back ): but with a vengeance I guess I made it mad ? so about 3 weeks ago it went nuts taking over everything again. Had I been alone I would have started to crying But the girl Aka amcarrig was around and looking 6. I was about ready to go the Barley extract route a week or so back but in a marine system that can be devastating to many corals and while I was almost out of options other then just ripping it all down and nuking it all and restarting ? Amcarrig ran up on a product called Ultra Algae X.. 7. Got the algae X going. Its very expensive but WTH, so is saltwater and labor as a last ditch and supposedly safe algae fix I /we took a shot she ordered some . I messed up on the first 3 doses last week.. Then i caught my mistake and following the label directions almost to a tee I added 40 ml last Tuesday night after lights out then Thurs night then last night today I can honestly see where its breaking up and dieing off and all in the skimmer .. It seems to be working like a charm still its 21 day treatment so I'll follow up but at this point I'd recommend it to all and see if it works as well ? But follow the label closely . The product is ULTRA ALGEA x as in a medicine , It comes from Germany and it can be hard to find as its just making its way big time into the States here . Its made by a Co. called Fauna Marin and at this point I'd say worth every penny.. But you have to remove all algae from the system you want to keep I simply cut off my refugium control valve ..