[samksy]

Most of my sps polpys only come out after the lights are off. Why is that? After light comes on for a while most of my sps polyps retract. Is this how most SPS behavior????

	SPS Small Polyped Scleractinians - Sometimes known as Small Polyped Stony corals. These are hard corals that have extremely small polyps. They are typically on the difficult side and require Metal Halide lighting or dense Power Compact or T5 arrays. These corals are prized for their rareness and ability to be easily fragged into multiple colonies.

[Tonyscoots84]

I can't really speak much about this cause for some reason all my sps polyps are out. how is the flow in the tank are the corals getting hit with direct flow. is it all ur corals that do this. I used to have one sps I forget the name of the 1 coral that did it to me the polyps only came out at night but it was only for a short while then I guess it got used to the tank and the polyps are out during mh light period.

	MH Metal Halide Lighting, typically used for high intensity light demanding corals such as SPS. Bulbs come in varieties of spectrums (7k, 10k,20k), and intensity (175W, 250W, 400W).

	SPS Small Polyped Scleractinians - Sometimes known as Small Polyped Stony corals. These are hard corals that have extremely small polyps. They are typically on the difficult side and require Metal Halide lighting or dense Power Compact or T5 arrays. These corals are prized for their rareness and ability to be easily fragged into multiple colonies.

[autoponicz]

maybe too much light?

[samksy]

Quote: Originally Posted by Tonyscoots84 I can't really speak much about this cause for some reason all my sps polyps are out. how is the flow in the tank are the corals getting hit with direct flow. is it all ur corals that do this. I used to have one sps I forget the name of the 1 coral that did it to me the polyps only came out at night but it was only for a short while then I guess it got used to the tank and the polyps are out during mh light period.

I have two tunze 6101 on pulse and NIGHT mode. The wave is not direct. Most sps dont' have polyp extension after the light comes on. after the light goes off, they all come out. Only certain mill have polyps extension, other than that, they are retract after the light comes on. Also have a sea swirl return. (3/4).

	SPS Small Polyped Scleractinians - Sometimes known as Small Polyped Stony corals. These are hard corals that have extremely small polyps. They are typically on the difficult side and require Metal Halide lighting or dense Power Compact or T5 arrays. These corals are prized for their rareness and ability to be easily fragged into multiple colonies.

[samksy]

Quote: Originally Posted by autoponicz maybe too much light?

I have 4X 4ft T5, two actinics, two daylight and 3X 250 DE. After the actinics comes on, the polpys would start retracting already...so i don't know if it's even the lights.

[ming]

It seems normal to me. My SPS polyps tend to look slightly more extended during the night, and less during the day. You can't really tell the difference on Acropora Millipora, but on Acropora Acrpora species, I notice the the polyp extension is longer

	SPS Small Polyped Scleractinians - Sometimes known as Small Polyped Stony corals. These are hard corals that have extremely small polyps. They are typically on the difficult side and require Metal Halide lighting or dense Power Compact or T5 arrays. These corals are prized for their rareness and ability to be easily fragged into multiple colonies.

[gnatp2]

In the wild, many sps only have their polyps out at night. My polyp extension is def greater at night.

You could have a fish or invert who is harassing your corals. I did (flame angel and emerald crab). Once I got rid of these guys, my polyp extension increased.

Also, it could be flow. Check out 2Sunny's post. http://www.manhattanreefs.com/forum/...rch-paper.html


So, in short, it could be a problem or not.

Nate

	SPS Small Polyped Scleractinians - Sometimes known as Small Polyped Stony corals. These are hard corals that have extremely small polyps. They are typically on the difficult side and require Metal Halide lighting or dense Power Compact or T5 arrays. These corals are prized for their rareness and ability to be easily fragged into multiple colonies.

[hippotangs]

I also experienced polyp extention more during the night, for corals such as millies.

[samksy]

Quote: Originally Posted by ming It seems normal to me. My SPS polyps tend to look slightly more extended during the night, and less during the day. You can't really tell the difference on Acropora Millipora, but on Acropora Acrpora species, I notice the the polyp extension is longer

I don't really see any polyps extension when the lights are on, but the millepora. After the lights are off for a while, they polyps are full extended. I have seen tanks that have polyps extensions even when the lights are on.....so just thought there would be something that can help.

[samksy]

Quote: Originally Posted by gnatp2 In the wild, many sps only have their polyps out at night. My polyp extension is def greater at night. You could have a fish or invert who is harassing your corals. I did (flame angel and emerald crab). Once I got rid of these guys, my polyp extension increased. Also, it could be flow. Check out 2Sunny's post. http://www.manhattanreefs.com/forum/...rch-paper.html So, in short, it could be a problem or not. Nate

I do have an angel but i really don't see it picking on the sps. Plus even if he is, i doubted he can constantly pick on 60 sps in my tank to cause them retract all the time when the lights are on.

I think the flow can definetly be one thing that can be the cause, i'll be checking on that. I have two tunze 6101 running at 80% on each side, not sure if that's too much or too little, i'll have to play with that. and they are on pulse function.

It's probably not a problem but i would love to see polyps extension all the time...that would be nice. My stuff does grow, so i wouldn't say it's a problem.

Quote: Originally Posted by hippotangs I also experienced polyp extention more during the night, for corals such as millies.

Same here, and they look great with all those polyps extension

	SPS Small Polyped Scleractinians - Sometimes known as Small Polyped Stony corals. These are hard corals that have extremely small polyps. They are typically on the difficult side and require Metal Halide lighting or dense Power Compact or T5 arrays. These corals are prized for their rareness and ability to be easily fragged into multiple colonies.