100watt halide fixture?!?!? Are you sure it's not a mercury vapor fixture masquerading as a halide? Got a link?
Sun corals can be really gorgeous specemins as long as you know what you're getting yourself into. The biggest trouble is training them to come out when you want them to. You have to be religious about adding food to the tank with a turkey baster at the same time everyday to get them to come out at the same time. Somehow they learn, don't ask me how . As for the lighting, I wouldn't blast it with a 400watt halide atop my rock stack, but I wouldn't be too concerned about having it get some light. Generally they do well near the bottom of the tank, and if possible under an overhang is a pretty cool place to put them.
One word of note. Do not, I repeat, do not keep cleaner shrimp or any species of crab/hermit with them. Over time they'll learn that you're feeding the sun coral and will go after it to tear the food out of the sun coral's mouth, utlimately killing it. They're not eating the sun coral per-se, but goin after that food is stressful over time.
Sun corals can be really gorgeous specemins as long as you know what you're getting yourself into. The biggest trouble is training them to come out when you want them to. You have to be religious about adding food to the tank with a turkey baster at the same time everyday to get them to come out at the same time. Somehow they learn, don't ask me how . As for the lighting, I wouldn't blast it with a 400watt halide atop my rock stack, but I wouldn't be too concerned about having it get some light. Generally they do well near the bottom of the tank, and if possible under an overhang is a pretty cool place to put them.
One word of note. Do not, I repeat, do not keep cleaner shrimp or any species of crab/hermit with them. Over time they'll learn that you're feeding the sun coral and will go after it to tear the food out of the sun coral's mouth, utlimately killing it. They're not eating the sun coral per-se, but goin after that food is stressful over time.