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What is this spot behind the eye and what is causing it? How can i reverse it?

How long can I keep water in my mixing can before I use it? I made some water about three weeks ago and am finally getting around to using it. It has been in a Brut trash can with lid, heater and two pumps to circulate the water. Safe to use or should I dump it and start over?

I have a 90 g mixed reef. Nitrates are too high and am in the process of getting it down. I did a 30 gallon WC yesterday by siphoning the heck out of the sand bed. (Used RODI water and Instant Icean Reef Crystals) Afterwards my way too many little sea stars which seem to be reproducing like...

My nitrates are very high - looks like 60-70. Will a good big batch of snails help clean up some of the excess waste around the tank and bring it down? I have zero algae issues. What is the best tester? I am using the Salifert kit. May be willing to spend the $ on a digital tester...

I have 2 AI Sol's being controlled by their "New Controller". I turned all the power off on my tank to do some maintenance and when I turned it back on the lights were a full power. Anything I tried to control with the controller did not work. I upgraded to the most recent firmware, reset to...

Anemone has gone from opening up to over a 12"x12" space to this. I has always been "rooted" under the rock. After not seeing much activity for a week, i flipped the rock over and saw this last night. This morning it had moved about 3" to get below the rock again. Clowns are all over it trying...

I have 2 hydor 1400 circulation pumps connected to a hydor smart wave. When the fans startup, they make a knocking noise that scares my fish. I called Hydor and they that it is just the way it is. Nothing can be done. Make sense?

Growing in several places around tank. Mainly in shadows.

My yellow tang is losing its yellow color and turning a very light yellow/white. Why? Solution???

I have a 90 gal mixed reef and both koralia 1500's need replacing. I got decent flow from them, but always thought the tank could use more. For viewing purposes I have one on the left side, but the other is on the back right side of tank. I would like to keep it that way, but understand that...

Got a mushroom that is growing like crazy and is taking over some Zoa's I have. How to trim back? Just pull of rock? Anything to worry about?

I just changed the filter on my RODI unit (though not the RO filter) and my output has dropped to just a few drops - literally. Any idea what i did wrong? How to fix?

Just noticed this in my tank. Is this Aptasia?

I have 2AI Sols on my 90gal tank. Soft corals at this point with some anemone and fish. Just got AI's "new controller". Does anyone gave a reco for the settings regarding light intensity and timing? Or know of a good site with some recommendations?

My skimmer used to fill my cup about every week or so. I have noticed that it's output has basically fallen to zero. eShopps cone skimmer s-150 Is there something else i need to adjust, check, etc? I have played with the height, output, but don't know what else to do.

Once again I bought some corals, but cannot recall the names. Any names will help along with care tips. Thanks!! Sorry, trying to use new iPad and am having trouble adding attachments.

I am using a rubbermaid 42gallon container to mix RODI water with Instant Ocean Reef Crystals for my water changes. I have a powerhead and heater in the container to keep it at temp and moving. So, I noticed today a lot of debris at the bottom of my container -- looks like sediment from the...

Is this Aiptasia? Just noticed it growing on a rock.

What is this stuff growing in my tank and how do i get rid of it? I have a large group coming to my house and want to show off the tank, but not with this stuff growing. phosphates are 0.11 (too high??) I have a 90g and did a 25g water change 4 days ago, but I was without power for 7...

I have a ricordea on the floor of my tank and want to move it into some rocks and let it grow around them. Problem is that it is in a frag plug and seems to be pretty securely attached. * Can I get it off the plug without damaging? *How? Should I just leave it in the plug and break off...