Finally an easy solution to bryopsis!

I have some bryopsis, and I'm going to treat it with peroxide and post before / after pics soon. It is on structural rock with with SPS, so I'll be applying it very carefully.
 
Perfect! Thank you for contributing.
Red brush algae happens to be the communicable disease of my lfs...
Thankfully peroxide is a wide spectrum macro and micro algaecide

Sps aren't particularly sensitive when spot treatments are ran, just the tiniest drop of peroxide will wick into the strands via capillary action can't wait to see your after pics.
 
We get red brush algae around here too, but the variety that we have popping up really only likes low-K temp light (10K or lower) and really high nutrient levels. A normal healthy tank that also has really blue lighting probably won't see much of the red brush. I don't know how invasive other forms can be, but we have a few suppliers around here that use natural filtered sunlight, and there's always a small tuft of red brush algae to be found among their frags, but nobody I know of has ever had a problem with it.
 
Mexican turbo snails LOVE geldinium (red turf algae) and will make short work of it, FWIW.


I'll have to grab a few then. This has plagued me for sometime now and FWIW the Tech M treatment does not work against it. I tried it for about 40 days (10 to increase my Mg levels and sustained for 30 days) all it did was cost me several astrea snails and throw off my chemistry which I feel is costing me some LPS livestock. :facepalm:

I'm trying to combat it now with a couple of sea hares and diadema urchins. They're both eating it but its like BBQ right now, low and slow.
 
Thanks so much for all those updates!

After six weeks of decent results, but not 100% victory, I am moving today to Hydrogen peroxide....
 
since August, i haven't had bryopsis come back since I started with Kent M. I ran out and couldn't find any more, so I switched to Brightwell to get it up to about 1500. After I did that, Bryopsis died off competely. The BRYOPSIS died off completely. I still had hair algae in the tank.

6 months later, no bryopsis. We're still battling hair algae with toothbrushes and scrubbing, but we've now pinned our hopes on coralline algae out-competing the hair on the rocks. Meanwhile, my refugium is now full of caulerpa prolifera, my favorite macroalgae for a refugium. I like it more than chaeto, in fact. Anyway, we're still getting hair algae growing on sand, and on frags, but we're getting a hold on it. I plan on hitting my zoa and mushroom and acan frags with a H2O2 dip soon.

but... no bryopsis anymore, and I've stopped dosing Mg for about 4 months, now.
 
since August, i haven't had bryopsis come back since I started with Kent M. I ran out and couldn't find any more, so I switched to Brightwell to get it up to about 1500. After I did that, Bryopsis died off competely. The BRYOPSIS died off completely. I still had hair algae in the tank.

6 months later, no bryopsis. We're still battling hair algae with toothbrushes and scrubbing, but we've now pinned our hopes on coralline algae out-competing the hair on the rocks. Meanwhile, my refugium is now full of caulerpa prolifera, my favorite macroalgae for a refugium. I like it more than chaeto, in fact. Anyway, we're still getting hair algae growing on sand, and on frags, but we're getting a hold on it. I plan on hitting my zoa and mushroom and acan frags with a H2O2 dip soon.

but... no bryopsis anymore, and I've stopped dosing Mg for about 4 months, now.

can you provide the details of your H202 dip? (dose of peroxide, volume of seawater, time duration) many thanks
 
i plan on attempting spot-treatment with straight H2O2 aka hydrogen peroxide through a syringe this weekend, but there are two other types of methods using H2O2:

straight dip of live rock:

I have a cantalope-sized piece that had too many crevices for us to get with a toothbrush. It has a few pieces of Kenya Tree coral on it, so i dipped it in this fashion:

filled up a bucket with about 3 inches of 50/50 h2o2 and sea water. i pulled out this rock w/ the Kenya on it, and placed it in the water. set timer for 5 minutes. when timer went off, I turned the rock so that one side was in the solution, set timer for 5 minutes.
I turned the rock every 5 minutes, soaking all parts of the rock but within about 1-2 inches of the kenya. one time, i had a baby (inch-long) sprout of kenya under the solution for 5 minutes. it seemed fine the next day.
Within 48 hours, every single bit of any hair algae was gone. The rock was bleach white; any coralline that was on there (not much) was gone, as well.

The other process that i'm going to try with my zoa frags is to put the frag into some salt water, and the instuctions I read was to slowly add h2o2 until the frags/plugs started to bubble a little bit, and to keep the frag in the solution for 5 minutes. I'll be trying that soon.
 
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... and I did not rinse off the piece that I dipped - i just let it drip for 5 seconds and placed it back into the display tank.
 
ok, I tried some H202 dosing over the weekend:

I spot-dosed some rock in the display tank, and I also dipped some zoa frags.

for the spot-dose onto fixed, big rockwork in the tank:
I turned off in-tank Koralia pumps and dosed a side of a big rock with 5 mL syringe of straight h2o2, about a dozen times, on Saturday night. 24 hours later, no noticeable difference. lots of bubbling at the time, but didn't notice a change on Sunday night.

For the frags:

at this concentration: 1/2 gallon tank water, 80 mL h2o2 - for 5 minute dip.
I dosed 4 frags, all 4 were zoas/palys. 1 was an RPE frag.
the next day, algae is pale, starting to fall off. All visible zoas look fine.

Sunday night, last night: I cut the concentration in half - 1/2 gallon of tank water, 40 mL of h2o2. 5 minute dip for each of these.
I will report my findings. I"m curious if the lesser dose is enough to kill this hair algae.
I dipped 4 frags - 2 zoa frags, a toadstool, and a ricordea mushroom.

I will report what else happens -
 
Also I wanted to add that kill time is proportional to the age of your peroxide bottle after initial opening

A coke bottle unopened still has notable pressure after a year

But open the lid once, and you can wrench tighten it back on, seal it with makers mark wax, epoxy the lid back on etc and it will have no pressure in a month because the seal was broken. Peroxide holds its supersaturation a little better but anything less than a brand new 75c bottle is wasting time
 
I love the scientific aspect it's taken. When I moved tanks and had live rock riddled with GHA and bryopsis, I opened the bottle of 3% peroxide and whizzed it all over the rock like I was watering a garden, or writing my name in fresh snow.

It worked lol.
 
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