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Can you name the softies?
I'm losing hope on LPS in my tank too. Prob is that i too have a lot of softies and by now it's hard to place them "far"
one thing that may cause the warfare is anemone. i got two huge ones in my tank and they are suffocating everything around themselves, so i'd assume the cabbage under it is not feeling too good...
Yup one is a Sinularia leather (when fully inflated it is about the size of my hand with my fingers outstretched) and the other is a Devils Hand leather (when fully inflated about the size of my palm). They are both not close to anything else or each other and certainly don't touch anything so if they are the cause they would have to be excreting enough toxins into the water to severely impact a 750L system.
When it comes to anemones my understanding is that they "sting" other corals through touch, they don't let toxins go into the water unless they get minced up by a powerhead so with them its not really considered "chemical warfare". They are a pain because they can move around and sting multiple corals though.
Actually i thought u're overdoing this as i have 2 of the similar LED's (viparspectra) and i keep them at 4 inches above water and run at 85%/65%. Always thought of getting the third one for more even spread, currently it's a bit shaded in the center. Perhaps the best idea for you too would be to move that thing lower. My tank is 900l (2mx0,8x0,6).
Next thing i'll do is tune up the whites to at least 80% and go to 90-95% with the blues.
If I lower them any further the spread won't cover very much. Every 6ft tank I have seen has them quite high up to ensure the spread covers the whole tank. If I lowered them then I would have to get a 4th. I assume you have the longer 300W versions? That would be similar to me having 4 165W versions over mine. Have you measured your PAR at all?
If it's a similar issue feel free to post in this thread.Hope you don't mind posting under this same thread, but my problem is that all LPS are fading with me too and the typical location i've been putting them is the circle on the left. Whereas the two on the right are clearly the regions where anemone is fighting the lobo's. I can't see anything bad happening to the softies nor the anemone, but the mystery of fading LPS seems to be hopeless. Not sure if it could also be the toadstool? I'm thinking of giving up on LPS and proceeding with the softies only as water parameters don't show anything bad, but i haven't been able to grow a single LPS so far. They don't even open up when in my tank mostly. Maybe someone can elaborate on the reach of allelopathy?
It looks like your light drops off towards that area? Maybe there isn't enough. Or if you have a lot of softies then it could be a chemical issue but I don't know how to see if that is the problem or not.