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Old 11-07-2010, 12:06 AM   #1
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Exclamation Why does my Duncan Spit out his food?

I have had the tank for a year but only just recently started adding Coral 2. I have T5 HO with LED about two months old
3. Nitrate: 0
4. Calcium: 448
5. Phosphate: undetectable (Modifed refugium Sump with lots of MacroAlgae- Halameda, Mermaids Fan, Chaitamorpha (sp?), Shaving Brush, and Cualerpa)
6. Alkalinity: 1450
7. pH: 8.2
8. Salinity:1.025
9. Temperature:77.5
10. Liquid or strip test kits: Liquid
11. Location in tank: Living Room
12. Current amount of flow: 300-400
13. Current tank dosing regimen: Iodide, Fe, Ca, Mg, St, all daily at the lowest recommended dosages
14. Nearby coral: Scroll coral
15. Explanation of problem: I feed him and he spits out his food. I would think it was poop if it did not look exactly the same as it did when he ate it. Is this normal??

I lost a shaving brush plant today and am not sure that I caught it before too much decay. He had done it one time before on something I thought was just too big (he easts ANYTHING he can fit in his mouth) but then he did it again today. I feed him enriched brine and flake because he likes it. He spit out a mound of flake. Is this because he is sick, or can't digest the flake, or is he just pooping and I should relax? Any assistance would be greatly appreciated. It's not as though there is a wealth of info out there about these guys.
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Old 11-07-2010, 01:31 AM   #2
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I've never purposely fed coral flake food. I'm thinking they wouldn't necessarily like it. If it's spitting it out, I'm guessing it's because it doesn't see it as food.

I feed my Duncan mysis shrimp, chopped prawn, and Rod's Food once a week or so. When it eventually poops it out, it's long brown stringy stuff. I'd try meaty foods (not the enriched brine) and see if it doesn't like that better.

Just as an aside... are you testing for Iodide since I see you're dosing it. Seems like folks run in to more trouble than they think they're solving when they add iodide/iodine. Also... adding Iron? I'm thinking you could probably ditch the dosing, except maybe the Ca/Mg, and you wouldn't notice the difference.
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Old 11-07-2010, 03:26 PM   #3
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Iron and Iodine/Iodide dosing

I am dosing those two elements because I have a lot of macro algae that require it. My Iodide is only .03 when natural seawater is .06 and my Fe is not even enough to register on a liquid test yet. I'm pretty sure that is why my shaving brush died. I dose the Fe using a very slow drip so it is not all added at once. I have been dosing for two days and still have no measurable amount in my water. Yeah, I did some research and found that most of my coral could care less.

I fed my Duncan again just enriched live brine and he did the same thing again only he did not let go of the mass. He kind of held on to it like he was eating them one at a time. Do they pull them into their mouths and wait a while before pushing them out to eat bits at a time?? Today he is happier but I still have not seen him eat and keep what he ate. I have ordered the food you suggested. Thank you for the tip. I am also waiting for the Coral Frenzy that I ordered 5 days ago to arrive so I can start using that. Are you familiar with that brand? If so, what's your take on it? I don't have a lot of faith in this live brine shrimp but I also have yellow colony polyps that do eat them.

Your timing suprised me, too. I was under the impression that I needed to feed him every evening. That makes it a lot easier. he he Would he be spitting it out because he's being fed too much?? He's a bit happier today, obviously since there is no dead shaving brush fouling his space and all testing came back very good so I think I dodged a major bullet there. He's very small compared to all the Duncan pics I've seen. He's just a tiny little guy-one little head and I have only had him for two weeks.

I have pics to load but have yet to figure out how to do it.

Thank you for your help. I really appreciate the advice. :->

T from Tampa
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Old 11-07-2010, 03:30 PM   #4
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I personally would not target feed him. They get all they need from the lighting and water column. My tank is over 12 yrs old and I`ve never target fed my corals except my orange sun polyps which have to be fed. I have many LPS corals that have grown 5 or 6 times their original size and never been target fed. That is my experience anyway.
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Old 11-07-2010, 03:37 PM   #5
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WOW! The information I found on Duncans said target feeding is REQUIRED. This is so not an exact science. ha ha

I wondered why they need that when they wouldn't necessarily get it in the wild. Very confusing but it sounds like I can relax a bit either way. Thanks for the input.
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Old 11-07-2010, 09:32 PM   #6
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Quote:
Originally Posted by sarsim9697 View Post
WOW! The information I found on Duncans said target feeding is REQUIRED. This is so not an exact science. ha ha
be careful of what you read. i have found many mistakes on well known websites. they all seem to copy and paste what someone else says about a coral or fish. i always found it useful to double check your information with people who have kept said creatures.
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Old 11-07-2010, 11:18 PM   #7
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I fed him a nice fat piece of prawn and he gobbled it up. FANTASTIC! I think he just didn't like the flake or the brine shrimp. I thought the piece was too big but he munched it. I'm reminded of Little Shop of Horrors-good thing these things are not that big. ha ha

Thanks for all the good info.
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Old 11-08-2010, 01:43 AM   #8
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Don't feed them too large of pieces. They may eat it, but later they'll spit it out, which just ends up fouling your water. Chop anything up into fine bits.

Duncans don't *need* to be fed, in most tanks. Most LPS won't complain about being fed, but they normally don't need it assuming all other things are OK.

Are you *sure* that you need to dose iron and iodide for that macro algae? I don't keep the stuff myself, but it seems like most of those macros people keep in their refugiums to suck out nitrates and phosphates... and I've never heard of people dosing iron and iodide for them. Some of the other macros you note want calcium, but that's a different story. I don't think your corals could "care less" about overdosing on iodide - it'll kill them pretty quick.
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Old 11-08-2010, 09:35 AM   #9
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One of the primary rules of marine aquariums it Don't Dose ANYTHING you Don't Test.

Do you have reliable, unexpired tests for every checmical you are dosing?
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Old 11-08-2010, 09:50 AM   #10
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i have seen LPS die from overfeeding as well. it seems they can't process large amounts of food like that.
a couple times a week tops, and small pieces would be my recommendation also.
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