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Looks to me like an epoxy with plastic chips sprinkled on.

Sorry for the delayed response. Yes I feed quite a bit and the seahorses are messy eaters, only partially digesting the food. I'm up to, and stopping at, 7 sea horses now and feed at least 5 cubes a...

The screen is getting a tiny bit greener every week. But the 'exciting' news is that there was a nice little fat tuft of green hair algae growing on the bubble wand. First time I've had hair algae in...

2 more tiny spots of green on the screen this week! Another big change in the last 3-4 weeks is the amount of slime algae that grew on the sides and bottom of the scrubber chamber. It went from thick...

Yeah I now notice there is a little more air on the right, but the whole face does get pretty well saturated with air. Next time I clean it I'll make sure the air wand is not fouled.
...

Been a few months since I posted. Moved back to the single sided screen canted at 15* into the bubble 'wall', 18 hours on per day, LEDs (8 red 4 blue), weekly scraping of brown/yellow slime. Last...

I'm giving it another week, but then I think I'm going back to the single sided version. So far the 2 sided just hasn't had near as much growth on the screen and there is lot more maintenance having...

Yeah I got the LEDs from this guy on ebay: http://www.ebay.com/sch/ledtoplights/m.html?item=110800347347&sspagename=STRK%3AMEWNX%3AIT&rt=nc&_trksid=p3984.m1439.l2649&_trksid=p4340.l2562

But it...

Currently I think I'm having mixed results. With 5 days into this growth it doesn't look anywhere near as thick compared to how the single sided looked. But what concerns me more is that the mirrors...

I just made it 2 sided today but before I was getting good growth single sided. You can look earlier In the thread to see the pictures.

Also, advice for those using a slit pipe like mine, simply sawing a straight slit didn't work well for double sided. I ended up drilling a series of holes the length of the slit to make scalloped...

And it's done:
http://i161.photobucket.com/albums/t206/armorbimbo/IMAG1461.jpg
http://i161.photobucket.com/albums/t206/armorbimbo/IMAG1462.jpg...

Here are a couple out of tank shots:
http://i161.photobucket.com/albums/t206/armorbimbo/IMAG1460.jpg
http://i161.photobucket.com/albums/t206/armorbimbo/IMAG1459.jpg

Okay, can do. And just as an FYI to you/others, there is a paper backing that isn't ideal, in my opinion. I'm scrubbing it off to have one less unneeded biodegradable substance in the tank. Adding...

Almost finished with the 2nd version, 2 sided. There will be mirrors mounted to the 2 egg crate angle walls.

Quick video of the bubble test:...

Hey SantaMonica, or anyone really, I'm nearly finished with my 2nd version UAS double sided and I've got a couple of those 6x9 mirror cards you sell. Any ideas on how to afix them flush to 1/2" egg...

Week the 2nd after adding the LEDs:

Front:
http://i161.photobucket.com/albums/t206/armorbimbo/IMAG1421.jpg

Back:
http://i161.photobucket.com/albums/t206/armorbimbo/IMAG1422.jpg

Looks like...

I've seen seen several others who have used a diffuser and seemed to show improvement. My week old LED build was built with a diffuser from the get go. I think that if you have an imbalance of...

Week 1 results after adding LEDs:
http://i161.photobucket.com/albums/t206/armorbimbo/IMAG1385.jpg
Scrapped it down and I could feel rootyness bellow the slime. And then I flipped it over...
...

This please^^

Because of the way I mounted my screen I need something to scrape against. Built a little table that fits snugly behind.

http://i161.photobucket.com/albums/t206/armorbimbo/IMAG1354.jpg...

Got my LED power supply today...We be scrubbin'!

http://i161.photobucket.com/albums/t206/armorbimbo/IMAG1346.jpg
http://i161.photobucket.com/albums/t206/armorbimbo/IMAG1347.jpg...

Here is my LED box build. 8 red and 2 blue, removable diffuser, some gasketing just because I had it. Just waiting on the power supply and then it's ready to go.
...

The box for my LEDs is white, assuming that I'd want to reflect rather than absorb it.

Got a proper bubble wand and bigger air pump and have great coverage on the screen now. Unfortunately have to wait another week on LEDs as they sent me the wrong color...

I have a bunch of soft coral and I'm wondering if they would gain benefit from the extra "stuff"...

A general scrubber question: Do you all rinse/thaw your cubes of frozen mysis before feeding the tank? I know that seahorse owners are STRONGLY suggested to rinse before feeding to cut back on...

Yeah the glass cleaning might end up being a deal breaker for the UAS as right now mine is in an acrylic sump.

Still working on getting my LEDs together. Here is my UAS with a 15w CFL spotlight and 2 undersized air stones after about 2 weeks:
http://i161.photobucket.com/albums/t206/armorbimbo/IMAG1306.jpg
...

What are people doing to help prevent the massive amounts of salt creep from popping bubbles?

No offense taken. This is my first fish tank/system. Nothing like starting "small." :D Most of my knowledge is not 1st hand so I do the best I can with what I glean from research and asking...

http://i161.photobucket.com/albums/t206/armorbimbo/IMAG1262.jpg

Okay so it seems it's worth keeping the DSB. Here is my 2nd 'issue,' What to do with the cheato tumbler on the right? Ideally I'd love to remove the baffle and have a full tank DSB, but that would...

Keep in mind that check valves will always eventually fail due to the nature of a marine tank. Very often small feather dusters growing in the lines catch debris and prevent a valve from working when...

Well it all started when my wife sad, "If all the macro is going to die, can we put something else in there?" So unless the DSB provides a valuable part of the system we figured we'd put something...

With my soon to be turf scrubber I know that the macro in my system will slowly die off. This would leave my upstairs fuge fairly barren. So do I still need a DSB? Is it still useful or should I just...

Where I have gotten my acrylic: http://www.usplastic.com/catalog/default.aspx?catid=443&parentcatid=795
And some cement: http://www.amazon.com/IPS-Weldon-Acrylic-Cement-10315/dp/B003HNJEY0
Some...

I added a photo in the first post of the back of the screen.

I would think that it would very much encourage contact with the bubbles. Just need to make sure it's still easy to remove and to...

Actually the screen is on a 1/2 acrylic frame. But it doesn't look like many of the bubbles pass through. And once I have green mat growing no air would get through anyway.

None of my available...

So as a test fit I threw in some crappy 1" air stones.
http://i161.photobucket.com/albums/t206/armorbimbo/IMAG1248.jpg

The 15* angle of the screen causes the bubbles to fan out to a 4 inch...

Cool. That's what I assumed, but you know what happens when you ass-u-me...heh.

Would this be 3W or 1W LEDs?

A couple hours playing with various scraps of acrylic, egg crate and a $0.59 piece of screen gets me this:

http://i161.photobucket.com/albums/t206/armorbimbo/IMAG1244.jpg...

I'm assuming that with the top against the glass the fish were caught in the upstream between the glass and screen.

To help increase bubble contact on a single sided screen what about a slight tilt in the screen? It would seem to force contact while not giving up much in the difference of distance to the lights...

Once I am ready start adding the equipment I'll create a progress thread.

You know before a bunch of life stuff happened, as of a few months ago, my numbers were low but acceptable. Hadn't tested in a while and thanks to your post I tested again and now my Ca and Mag are...

Tank has been up just shy of a year. Everything grows very slowly at my temps, so there is very little spread. As well I don't blast my tank with light as you would a reef tank as I just need...

Added link in my sig with pics.

Really? I had read it was 1/2. 1/6th would make it a no-brainer.