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#1
09-10-2012, 02:05 AM
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Nitrates: 0
Nitrites: 0 Ammonia: 0 pH: I'll test for it tomorrow. Salinity is at 2.025 Running dual T5's ,bulbs are hagen brand ,and about 8 months old (Ya ,its time for a change) I've had the efflo for a good 5 months at least ,yes ,it has grown a bit since I got it ,had killer polyp extension up until a few weeks ago .I have a 425 gph powerhead near it. The sps around it is all doing fine ,its just the efflo and a peice of acro growing on the other side of the tank. It looks similar ,however it is smaller on the acro. The spots look like the tissue is damaged/ripping off. Also their pretty small :P Could it perhaps be emerald crabs ?? I only put them in a few weeks ago (the tissue damage started to show around that time) I dunno. I just really want this efflo to live. 
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#2
09-10-2012, 02:08 AM
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If it were mine, I'd do a reasonable(not too big) water change and replace the bulbs. Make sure there is no direct flow hitting it. Probably not the crabs.
Ca and alk levels would help too
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Brad
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#3
09-10-2012, 02:15 AM
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Ya ,I have hanna testers for alk and Ca ,but I don't really have the RO water to use with them
 However a water and bulb change are quite do-able. Its not under direct flow ,and has done quite well and the spot until now ,so I'm stumped as to what it might be.
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#4
09-10-2012, 02:20 AM
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I have a coral that would fade over a couple of days when the bulbs needed changing. Could be that. Start there, see if it helps. Don't over expose it, and don't change too much water, the coral is compromised, so nothing drastic
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Brad
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#5
09-10-2012, 01:19 PM
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Quote:
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#6
09-10-2012, 01:27 PM
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Quote:
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Brad
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#8
09-10-2012, 04:33 PM
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Yes ,the SPS around doesn't look the best ,the lighter piece was just introduced to the tank a few hours before hand. The milli beside did suffer some tissue damage at the base ,however it has good polyp extension and has been growing well.
Also that sounds like something to check for. I'll for to go out and buy a magnesium test. Thanks 
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#9
09-10-2012, 05:10 PM
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In addition to new lights, when I see white spots like that a few things come to mind:
-Super low nutrients (ie. excessive biopellets). Basically it's starving. But seeing that the other corals around it are not super hot, I don't think this is the issue. -Alk fluctuations. How are you topping up your calc and alk? It looks like the swings might be too large. -New GFO. I've had a couple of colonies go belly up on me if I change too much GFO at once. The process by which they depart sound similar to what you are seeing and takes a few days to a week. The GFO, in addition to dropping phosphates to very low levels, can cause other parameter fluctuations which can take out more sensitive corals. Based on what I see there, I'm putting my money on a parameter fluctuation; probably alk but it could be any one of them.
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#10
09-10-2012, 05:15 PM
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As dreef already mentioned, check to see what your Mg levels are at as STN from the tips down is often associated with a Mg shortage.
Running only a 2 bulb T5 fixture is likely also not enough light for your aquarium. To sucessfully maintain SPS under T5's, most people typically run either 6, 8 or 12 bulb fixtures. Personally, I feel that a 6 bulb fixture would be a little on the weak side to keep SPS happy and healthy. Also, I'm pretty sure that you've misidentified your Acropora. An A. efflorescens is one of the few plating species of Acropora and typically looks like this:  They are an extremely sensitive and tempermental species of acropora that often take years to color up and can sit for prolonged periods of time without growing or changing color. They brown out from changes in nutrient levels, changes in light or rapid changes in alkalinty very easily as well.
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