A while back I posted on a method for bryopsis algae control, that involved using Kent Marine’s product Kent Tech-M. And in that post, I also told you that one of the exhibits in my care was a 900-gallon reef tank with a persistent bryopsis algae problem, and that I was about to use this method to eradicate the bryopsis algae from my tank.

And . . .

Drum roll please. . . . . . . . .

It worked!

Yes, it worked quite well. Before treating the tank with the magnesium supplement (Kent Tech-M), we did the following important steps to prepare:

PREPARATION STEPS
Step 1: performed two 35% water changes to help up the magnesium level to the normal 1,300ppm and to lower the phosphate level;

Step 2: Manually plucked/removed as much bryopsis as possible while the water level was down (during the water change). We did this during both water changes over a period of one week.

Step 3: stormed the tank with a powerhead on a stick to help get as much detritus out of the tank as possible. We have 4 filter socks in the sump that catch it quite efficiently;

Step 4: Replaced the Rowaphos media (a.k.a. ferric oxide) in our chemical filter (Precision Marine SR55P Professional Series Substrate Reactor), which helps to insult and stress out the bryopsis algae.

Step 5: Began dosing kalkwasser (saturated solution of calcium hydroxide and R.O. water), which precipitates out phosphates so that the protein skimmer can remove them. It also elevates the pH to 8.3-8.5, which helps inhibit the growth of unwanted algae such as bryopsis and hair algae. And kalkwasser also helps to elevate alkalinity, which also helps inhibit unwanted algae.

Step 6: Turned off the activated carbon filter. This is just a hunch, but since the active ingredient in Kent Marine’s Tech-M magnesium supplement is not known (that which eradicates the bryopsis), I certainly didn’t want the activated carbon to remove it. Originally, people felt it was the elevated magnesium level that was doing the work, but after multiple methods of raising the magnesium level produced inconsistent results, it was concluded that Kent Marine’s Tech-M product worked the best because of some mystery active ingredient.

Now that the preparation steps were completed we were ready to begin dosing the Kent Tech-M (magnesium supplement). The main instructions are to make sure that you do not raise the magnesium level by more than 100ppm per day.

So I went ahead with dosing the tank to raise the magnesium level by 100ppm per day until the magnesium level was between 1600-1800ppm, and in one week the bryopsis dropped to less than 50% of what it was before dosing. And by two weeks, 99% of the bryopsis was gone from the display tank. I was quite pleasantly surprised.

Overall it took 2 weeks and the Bryopsis is now gone. It is my feeling that the aggressive manual plucking/removal was a critical step to insulting/stressing the bryopsis. And remember we did this just prior to changing out the Rowaphos media (lowered phosphates to zero) and the subsequent dosing of the magnesium supplement.

We will see what time will tell. I have heard of the bryopsis coming back after a successful treatment, so the constant vigilence will continue – as it always does with a truly successful saltwater aquarium.

Please comment and share your experience with hair algae or bryopsis and how you went about it and what happened.

Technorati Tags: bryopsis, bryopsis algae control, chemical filter, chemical media reactor, hair algae, kalkwasser, kent tech-m, magnesium, rowaphos

There are all kinds of algae problems an aquarist can experience in keeping saltwater aquariums, particularly with reef tanks. But none of them can be as nightmarish as Bryopsis.

Unlike most other algae, such as hair algae or cyanobacteria, Bryopsis does not respond to most removal methods. Even a normal algae problem can be extremely frustrating or even lead to someone giving up and shutting down their tank. But that doesn’t have to happen. There is a solution and I’m going to share it with you here in just a moment.

Typically, most algae problems such as hair algae or cyanobacteria, can be solved with a combination of:
- elevated pH
- increased water circulation
- removal of phosphates and nitrates
- removal of detritus, and
- addition of algae grazers (tangs, hermit crabs, snails, emerald crabs, urchins, sea hares, etc.)
- manual removal by humans (i.e. plucking, scrubbing, siphoning, etc.)

But Bryopsis is different, as it does not respond to these methods. Actually, it can often grow even more because of such methods (especially manual removal, which can feed asexual reproduction via fragmentation). And even biological controls such as adding grazing invertebrates and tangs is not only not very effective with Bryopsis, but it can be expensive (them critters ain’t cheap).

I wish I could say it was my idea – far from it. In fact, I have been dealing with a bout of Bryopsis recently in our 950-gallon saltwater reef exhibit at the Ocean Explorium, where I am Curator. And I was researching solutions to my problem when I cam across this solution. Here’s the link.

http://reefcentral.com/forums/showthread.php?s=&threadid=1113109&perpage=25&pagenumber=1

It explains the whole process in fair detail, with photos of results, showing the Bryopsis dying off and disappearing as a result of the treatment. I’ve also done more research on this method (thank you google) and it has actually been widely used with consistent successful results. And yet, it is a mostly unknown method.

Most people who get cursed with a Bryopsis algae outbreak, work like crazy for long periods of time, getting very frustrated, and still not even make a dent in the problem. Bryopsis algae outbreaks are usually caused by a new addition, where the algae comes in as a hitch hiker on a new coral or piece of live rock, or even a snail shell. So I’m glad I found it and even more glad to share it with you. Please be sure and share it with your friends too.

The method uses increased Magnesium levels for three months (1600ppm compared to the normal 1300ppm), to bring the Bryopsis to its threshold for binding Magnesium. This causes the Magnesium to then perform as an enzyme inhibitor, making the Bryopsis shut down and die off. Once this happens, the grazers in your saltwater aquarium will clean up the remains.

Point of caution: Be sure not to raise the Magnesium level by more than 100ppm per day.

Please post a comment here on the blog to share your feedback, or to tell your story if you are having any problems or frustrations with your saltwater aquarium. We would love to help you out in any way we can.

Technorati Tags: algae, algae removal, bryopsis, bryopsis algae, cyanobacteria, hair algae, magnesium, problem solving, reef tank, saltwater aquarium