Just some guy, you know?
So yeah,.. Even though SPS are "high" light there is allot more happening there in fact. Most people say to shoot for Par between 200 and 350 to have the most success with SPS, and it's true that the majority of them Saturate at that level, meaning they get every bit of light they want to grow at their maximum rate. Past the saturation point they start to Photoinhibit, which basically means growing slower due to having to protect themselves from the extra PAR. The way this presents in some coral is shifting color, or bringing new color out of the coral. This is why you see some tanks with wildly colored corals that are in the par range of 700 at the top of the rock. The corals need to be acclimated carefully of course, and not every coral can take this.And I thought THAT was a light hungry, can't get enough Coral? HUH? 🤔 I've a LOT to learn yet....
I've always loved Tangs, and back in the 'old days', I had a Yellow. But ever since I got back in the hobby, and sooooooo many people jumped on the 'They're ich magnet' band wagon, I haven't been able to get myself to get one......Heck, I honestly still don't know what direction I will be heading with this hobby. 2 months ago I would have bet the farm it was the SPS route......having 2nd thoughts about leaving 'softies' behind.....intrigued by a 'frag farming' idea. If Ya notice whatever it is, it involves staying in the Coral hobby....BEEN BITTEN TOO BAD.
But here's the deal,.. Even if you have your tank at 200-350 (mine is about 310 at the top right now) you will find that corals will color better and grow faster in certain levels, so experimenting by moving them around can yield results. (Give them at least a month in the new location before seeing minor changes). Here is a chart that helps illustrate my point. I got this off the internet, but I don't remember where the study was from:
You can see how varied the amount of light a coral can use is. But the other side of this coin is that they are highly adaptable, and even though you may not get maximum growth, you may find you like the color of a Milli in more like 300 PAR.
I've never really had an Ich problem with any of my Tangs (Knock on wood), but I feed them really well. My fish eat 3 times a day, twice on auto and once by hand.