Leds grows coral just fine. i have the same problem with one zoa frag. the others are fine. even ones i got from a tidal pool dont strech. dont think its always light related.
o and yes i have them in a shallow tank 30cm deep. with a 150w metal halide over them.
No, it's not aways light related. Most cases are thought.
Polyps from tidal pools won't stretch because they are in shallow waters. They have their stalks short. You're right! They have plenty light.
Polyps from tidal pools have the exact same ability to adapt to any aquarium light, just like any other polyp found in deeper water. They just happened to be found in a tidal pool.
Metal halides have same basic principal of LEDs in regards to present a hot spot, though it's spectrum usually has higher quality and uniformity. The corals and zoanthids simply love MHs the best!!!! That's a fact!!
Easier way to keep them is under T5s because of it's uniformity, which allows the placements all over the tank. That's also a fact.
LEDs are just toys to me. Im not flaming them, but exposing my experiences here. I'm fine with people loving their toys though..:thumbsup:
To resume: between LEDs, HO T5s and MHs I prefer MHs first, then T5s. I don't think would be worthy for me to get any type of LEDs anymore. When I tested them I was thinking about saving money with the electricity but that wasn't even close to worthy in my case. I prefer to have my zoas to the max!!!!
Grandis.
