zoathids and star pollups not open?

[segraves1]

well Tuesday evening I changed from 120Watts of NO fluorescent (about 8 month old bulbs now) to a brand new 250Watt 6500K MH.........

over the past two days I have noticed that some pollups open up, others open some of the time, and others don't open at all.......are they ****ed off by the sudden light increase?


I know people have issues with corals when they change out bulbs that their corals can get shocked and I'm wondering if that is what is happening to my stuff.......should I cut back to time (right now it is on from 8:30AM to 9:30PM)?


as a side note, today I noticed oxygen bubbles being released off the algae on the rocks (something I have not seen in months......guess the bulbs really were getting old)....

[graphixx]

Chris,

yeah you have issues with the light. with the increase in light it will stress the corals and sometimes kill them. you can do a couple of things. you can start with just a couple of hours of light a day and increase slowly, or you can get some screen sheets and layer them over the tank. and every week or so take off a layer os screen, this method works very well.

[segraves1]

well I went and turned off the lights for the day (guess they have had enough)......


how many levels of screen should I have?

[graphixx]

I would go with at least 3 preferrably 4

[segraves1]

just plastic (the non-metal) window screen right?

[dakar]

Yes, that's the stuff.