How much should hammer close at night?

[fox0521]

I had to adjust the flow in my peninsula style tank this weekend to address some dead spots. I lowered my MP40 which increased the flow for my hammer. When it has low flow, it spreads open wide, and usually stayed kinda expanded at night.
Since adjusting, it looks like this at night, and it’s not spread open as far as it was before during the day. Just want to make sure I’m not damaging it!

first picture is before during the day, second picture is after adjusted flow still during the day, third picture is at night after adjusted flow.

 

[Dolphins18]

Check your PH at night. They shouldn't be receding to the point you can see the skeleton.
I do not change my flow at all at night, and have great success hammers. Consider also keep that the same all day and night.

 

[vetteguy53081]

Thats how mine look at night. Then a few softball size colonies during the day

 

[JGT]

Agree, this is normal.

 

[fox0521]

Ph is 8.0 right now (no lights). Here’s a couple videos of the flow on these at night, just to be sure! Running MP40, reef crest setting at 67% power 24/7. 120 gallon, 4’ long peninsula. Line in picture shows approximately where I moved MP40 to, some corals moved but the hammers did not, they are in the same location.
This doesn’t look like too much flow at night?

 

[Dolphins18]

Ph is 8.0 right now (no lights). Here’s a couple videos of the flow on these at night, just to be sure! Running MP40, reef crest setting at 67% power 24/7. 120 gallon, 4’ long peninsula. Line in picture shows approximately where I moved MP40 to, some corals moved but the hammers did not, they are in the same location.
This doesn’t look like too much flow at night?

Give them some time, they still look fairly new <1-2 months. If you start seeing more and more skeleton, then it is time to worry. In the meantime make sure alkalinity levels are remaining in check, higher salinity 1.026 is more ideal as well.
Video looks better. Just watch, sometimes patience is key.

 

[fox0521]

Give them some time, they still look fairly new <1-2 months. If you start seeing more and more skeleton, then it is time to worry. In the meantime make sure alkalinity levels are remaining in check, higher salinity 1.026 is more ideal as well.
Video looks better. Just watch, sometimes patience is key.

The change in flow is new, just happened yesterday. The corals themselves I’ve had since last October. They were in my 55g, moved them to my 120 g last month when I tore down my 55 g. They were just one head per stalk when I got them, now there’s 3 heads on each stalk with new heads sprouting out of the sides! I just want to make sure I don’t kill them after all their progress! I’ll double check out my alk for the next few days too! Thanks!

 

[Dolphins18]

The change in flow is new, just happened yesterday. The corals themselves I’ve had since last October. They were in my 55g, moved them to my 120 g last month when I tore down my 55 g. They were just one head per stalk when I got them, now there’s 3 heads on each stalk with new heads sprouting out of the sides! I just want to make sure I don’t kill them after all their progress! I’ll double check out my alk for the next few days too! Thanks!

Ahh, thats what it is. Give them some time to adjust to the new tank, that always takes time. As long as it doesn't get a lot worse, you should be fine!