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It takes a 1/4 turn for a ball valve to open and close.
It takes 3-4 full turns to open and close a gate value.So the gate value is more precise.
Mark if its not threaded then you'll have to cut and glue the value in.
You might want to buy a whole set up.I'm sure you can find a nice one right here in the for sale/trade forum.There is also a lot for good info right here on NJRC.Here's a good place to start http://www.njreefers.org/joomla/index.php?option=com_smf&Itemid=26&board=97.0
Here's some info. on them.
http://reefcentral.com/forums/showthread.php?s=&threadid=1681392&highlight=EcoAqualizer
http://www.reefs.org/library/testing/ecoaqualizer
http://www.njreefers.org/joomla/index.php?option=com_smf&Itemid=26&topic=12748.msg118385#msg118385
never used one myself.
I've spoke to Icecap about dimming t-5s.no way.I think there is a way to dim VHO bulbs with Icecap ballast.
http://www.bluelineaquatics.com/products/dimmer/index.html
If you can take the rock out and dig under it with a screwdriver.That would work best.
If you can't remove the rock then during a water change try to dig it out with the screwdrive and have the siphon hose suck it out as you chip it off.
I find that the light color zoas like a lot of light.(up top)Dark ones like less light.(down low)I put all new frags low and move up slowly.(over a few days/weeks).The less moving the better. I also find zoas like some flow.(not direct though)
I started dosing vit c (Herb.com) about 6 months ago.After about 1.5-2 months everything slimmed up in the tank.Stopped for about 5 days then started again just not the dose they talk about on RC.Can't really say if it's doing anything.Most of my zoas look good though some don't.
I'd do this dip first
http://www.njreefers.org/joomla/index.php?option=com_smf&Itemid=26&topic=9048.0
A picture would be good.Also there is some good reading over on RC