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Depends on the coral I guess but most (given the right conditions) should be able to live forever considering they continuously grow/split/regenerate/etc. If I have a coral die I consider it my fault and assume I did something wrong... I never assume old age.

I run mine wet... IME wet skimming does a better job of nutrient removal in my tank.

Ditto on good water quality and lighting... IMO those types of products are a waste of money and just mess up the water quality.

Skimmer, Live Rock, Live Sand, Sump & Refuge... no power filter needed IMO.

Sounds like it is sheading... leather will do that from time to time.

Originally Posted by Samiam4663 I know about the purple stuff. That's no way to continue getting help...

so the pc's would be too much with the mh?? Not to much at all... I would run the PCs with the MHs. If I had 150w of VHO and 130w of PC would this be enough for anenonmes as well as a clam? Depends on the type of anemone and clam but with the 250w MH you would be able to keep anything you wanted to.

What are the tank's dimensions??

lol, looks like everyone has their favorites... but any of the high quality two part additive will do the job.

If you would like for it to stay in your tank I'd strongly recommend moving to the top of the rocks,

If you can get them close to the light they will be fine. How far down is the top of your rock work from the lighting??

ESV B-Ionic Calcium Buffer or equal would by far be the best for a 12g nano. It not only adds calcium but it also adds alkalinity in a balanced proportion. Don't forget the calcium and alkalinity test kits... Salifert makes some of the best test kits for ca/alk.

Originally Posted by orangespot Can 250W MH be bad for the fish...I have in 54 corner and it is bright. Any advice or suggestions. Thanks Not to my knowledge.

For easy colorful corals I'd stay with different types of shrooms & zoa's. What is your lighting??

You may be able to get by with 2-150w DE MHs if the clam can be placed high in the tank but if it were me I'd go for a couple 250w MHs. Lighting wise, 2-250w MHs will allow you to keep about anything placed about anywhere.

Double ended bulbs offer a few advantages over the single ended. They produce far more par watt for watt than the single ended & they last longer. Disadvantages would be that the initial cost is more and you have to have a glass shield to filter UVs... but most fixtures come with the glass...

Originally Posted by sufunk It looks like the tank im getting is 72Lx30Dx24W, 210 gallons. You dont think the 3x250mh 4x96pc coralife lights will work for that? 30 inches deep is too deep for that light? Id have mostly lps but some sps and maybe clams. Are you looking at single ended or...

Buy a calcium additive and a calcium test kit and keep levels around the 400 to 450 range. You will have a purple tank in short order. Don't forget about alkalinity... when adding calcium the alkalinity needs to be tested and added accordingly. Coralline and calcifying corals need both...

Are they single ended or double ended?? What kelvin, type of bulb and what ballast are they running on?? The general rule is around every 12 months but there's a little more to it than that.

Yes they are photosynthetic... what kind of lighting do you have?? They will also except food but lighting is the most important.