ok been researching so much my eyes hurt
was up untill 3am last night searching and about 6 hours today am i dedicated or just sad haha!
in genral seem that large tanks and 250/400watt halides are the common setup for H.Mags.
altho ive come accross a few accounts of them being keep alive under pc and 150-175watt hallides in tanks 18 inch and under (height)
here is an exsample from wet web medias FAQ:
Lighting for Ritteri anemones 11/27/04
Hello Anthony,
<cheers my friend>
I've read your advice that Heteractis magnifica do better under metal halide lighting. You suggest that long-term sustainability may necessitate MH lighting.
<'tis true... exception being dedicated displays under high intensity fluorescents where the animal is physically restricted (by tank/water depth) to live under the top 10" of the water surface>
The reason I am writing is to find out if the way I have my system set up is sufficient for long term (many years) success with this species. I have a Ritteri that I have had for 2 years now. The tips of its tentacles are literally about 3 to 4 inches from the two 96-watt power compacts and two 55-watt power compacts (all 10,000K) that light the system.
<ah, good to hear. And fine but with the warning/reminder not to go any bluer than the 10k K lamps you have now. Arguably, this animal would do better with warmer colored lamps. Go easy on the actinic blues though>
The anemone sits on a large rock in the upper half of an 18 inch deep tank. This anemone has more than doubled in size (it is about 17" across now) in the past 2 years and appears to be perfectly healthy and happy (from what I can tell--please see attached photos for your assessment).
<it looks well, although a bit pale. Feed it heavier and it may do better/be darker. or, it can be caused by the fluorescents exceeding their useful lifespan of 6-10 months, a bummer... poor value in this regard>>
It does not move and eats approximately a teaspoon of food (chopped silversides, squid, salmon, Mysis, shrimp, clams, etc.) every other day or so. By the way, I learned from you on WWM
within the past year to chop rather than feed whole--which is what I was doing before (thank you).
<excellent mate!>
I just want to make sure I am giving this anemone what it needs to live a very long life. Do I "have" to get MH's for long-term success?
<not at all here. You have a specialized set up that is well suited for this species. And your regular feedings are a very worthy support to more moderate lighting systems with high light animals>
I don't want to go to the expense of another lighting system, but I will if necessary I suppose. Also, I've read about the preferred Kelvin readings, would you recommend one of the 10,000Ks be replaced by a 6700K?
<actually, yes.. if you don't mind or would enjoy the warmer color>
Another thing, different advice on how often to change out the bulbs (some say 6 months others a year), what would you recommend in my specific case?
<Stagger their replacements to make the shock (increase in light) less stressful on the creatures... and do so by the tenth month IMO. If you really want to know the exact time to change them, do invest in a PAR meter. Apogee brand makes affordable hobby market units>
Thank you in advance for your recommendations, Gary
<always welcome my friend... best of luck/life to you. Anthony>