newbie Q: what indicates too much light?

goldmaniac

New member
Zoa newbie here -

so all I've been reading is that my 150w MH lights, plus a couple PCs, all in a hood, is on the lower side of light requirements...

14k Phoenix's, about 2-3 months old.

So i placed some eggcrate about 6" from the surface and put all my purchased zoa plugs (about 10 types) on this eggcrate, directly under my Phoenix HQI's, towards the top.

I did slowly acclimate them to this light, starting on the sand for 2 weeks, then halfway up for 2-3 weeks, and then up onto the top, on the eggcrate

HOWEVER, one by one, on any cluster of zoas that haven't been opening nicely, i've been moving them towards the bottom, giving less light. most of the troubled zoas have opened up since I moved them.

2 Questions:

1) am I right to conclude that 12" down (in a 24" deep tank) could still very well be enought light for some these guys, and that my dual 150 watt HQI Odyssea canopy is enough for a zoa tank? I'm surprised if it is.

2) one of my first zoas I bought were some RPE's, they were cherry red in the seller's forum, now they're faded/pink. Will too much light fade these zoas? Is this another indication that I need to move them? I moved them down and they opened up more, and they're really pink now, not the nice deep red I'm hoping for. I also have a cluster of Eye of Rah's that have darkened since putting under more light. think these guys just need LESS light?

thanks in advance everyone -
G.
 
You have more than enough light in the tank. They'd probably do fine even on the bottom. Often times when zoas get too much light they'll lose their color, turning brown and faded.
 
How do you know if they are getting too little light? Would 3 watts a gallon near the surface be okay for them?
 
combining acitinic PCs and two 150w HQI's, yes, about 480w of light, sitting about 10" above the surface. my tank is 2'x2'x4'

ok, i'll move some down and around, try different spots..

give each move about a week for zoas to adjust? sound about right?
 
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