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low light salt water setup questions
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number6
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Joined: 07 Feb 2003
Location: Ontario, Canada

PostPosted: 2009.01.03(Sat)22:12    Post subject: low light salt water setup questions Reply with quote

Well, I'm setting up a 100g FOWLR tank and I am thinking about lighting options...

currently, I have two 96W CF bulbs staggered over the 5ft tank. Depth is 25"

I'm thinking of adding softies to this tank like xenia, zoas, and mushrooms and I am trying to decide if I need to add my 200W of HO lighting or if the 192W of CF lighting is plenty for low light softies...

thoughts?
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SLACkra
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Joined: 06 Feb 2003
Location: Perth, Western Australia, Australia

PostPosted: 2009.01.03(Sat)22:24    Post subject: Reply with quote

Well I kept mushrooms growing at an OK rate under 60watts of NO florecents in a 21" deep tank. They were probably 14" away from the lights. Not sure how well the zoos and xenia would do though. If you placed them high enough up the rockwork they may do OK. I personally have a solitary zoanthid polyp that was a hitch hiker on my live rock growing slowly in the shade in my nano but mind you its 20litres with a 150watt metal halide 12" from the surface of the water.

In my opinion get yourself a small frag of zoas, xenia and then some shrooms and see how they do up high on the rockwork then just see how it goes.

Andrew
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Michael L.
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Joined: 20 Nov 2005
Location: Nanaimo, B.C, Canada

PostPosted: 2009.01.04(Sun)23:08    Post subject: Reply with quote

You should have no problems in the top 10" directly under the lights. Try to place your frags in that area and let them spread themselves. If they do manage to spread to the bottom of the tank, bonus, but I wouldn't expect the zoas to do that very quickly. Xenia and mushrooms should have no problems growing in that amount of light.
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number6
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Joined: 07 Feb 2003
Location: Ontario, Canada

PostPosted: 2009.01.04(Sun)23:34    Post subject: Reply with quote

Thanks guys... I also have a 20" 96W lamp I could throw above the rock archway that I'm going to build... that might do the trick for the zoas.
We'll have to see.

Eventually I might break down and order a 6 bulb TEK T5 setup... but for now, will try this one out.

I'd go with a MH but the profile of the hood is only 6 inches above the water. I figure water splishing up onto the bulb will burst it faster than you could say boo...

any thoughts on how to place glass or something between the bulb and top of the water if I tried a MH light? I wish I'd bought one of the lower profile MH lights... this one is tall!
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Michael L.
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Joined: 20 Nov 2005
Location: Nanaimo, B.C, Canada

PostPosted: 2009.01.05(Mon)0:25    Post subject: Reply with quote

What kind of metal halide setup is it? On all of the ones I have built, I have made sure that I put a piece of glass between the bulb and the water because they have been known to explode. I have also been told that they emit some harmful UV light that is filtered out by glass. Is this a retrofit metal halide hood or a pendant or something else?

On most of the hoods that I have built, I just get some 1/4" by 1" wood strips from Home Depot and brad nail them horizontally to the inside of the hood a few inches below the bulbs on either side of the hood. This allows me to slide a piece of tempered (very important) glass in to the hood very easily.
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number6
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Joined: 07 Feb 2003
Location: Ontario, Canada

PostPosted: 2009.01.05(Mon)9:59    Post subject: Reply with quote

yes, it's an older retrofit MH screw in style bulb...
so, tempered glass to protect the bulb won't break?

I can do that easily enough...
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Michael L.
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Joined: 20 Nov 2005
Location: Nanaimo, B.C, Canada

PostPosted: 2009.01.05(Mon)12:46    Post subject: Reply with quote

I've had two pieces of glass explode on homemade metal halide hoods. The first one, I used normal, untempered glass. It took hours to clean the glass out of the fortunately unstocked tank. On the other one, I used tempered glass over a fully stocked frag tank. No mess to clean up on that one. The reason for both of those incidents was that I forgot to turn on the cooling fans on those hoods.
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number6
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Joined: 07 Feb 2003
Location: Ontario, Canada

PostPosted: 2009.01.05(Mon)19:50    Post subject: Reply with quote

Well, thanks to some great advice and some extra research, I am adding the T12 HO bulbs running on the Ice Cap so I can grow Zoas and I've purchased some waterproof T5 HO end caps to use when the T12's are not useful in one year... so I can reuse the same configuration but just order HO T5 bulbs when the time comes and minimal wasted money!!!

So I'll end up with around 400W of lighting, just mixed CF and HO tubes!
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