Questions - Need some input

Ive had the 3 species of acans in my tank for about two months now and I am noticing them turning white on the tops? I run all LEDs and they are in the sand bed but one that I had mid level in my structure has also gone white. These acans are all reproducing very quickly one of which has grown 6 heads from the original 3 that I had a month ago. My levels are all perfect Nitrate and Nitrite 0 Phosphates 0 pH 8.4 calcium 450-500 and Alkalinity 9. All of my other corals are doing very well and I have ...

For the past 2 months I have had the pest macroalgae, Briopsis, growing in my tank and it is starting to get really bad IMO. Now i know the only sure fire way to get rid of this stuff is to raise my magnesium levels to at least 1500 ppm. But I have an SPS dominated tank and raising the magnesium too fast or at all could kill them all off. However, I have nowhere to put them while raising the magnesium levels. So I have a 100 gallon tank and a 30 gallon sump and my question is how to raise my magnesium ...

Are sea hares reef safe? i.e will that eat sps, lps, or polyps?? i know they are awesome for algae but just wondering how reef safe they really are

Hey guys I have a tank that I'm doing a refugium onand I was thinking about using refugium mud more specifically a product called Fiji mud/Fiji gold by Walt Smith. So has anyone ever used this product and or does anyone prefer sand over mud? A product review would also be appreciated

I have always wanted a foxface in my tank but I keep reading (shocker that im doing my research first huh guys? -_-) that they are not reef safe however I keep seeing these awesome fish appearing in a bunch of FTS and close ups in reef tanks on here?!?! are these guys more reef safe than what has been said about them? Like i said i would really like one and at the least if they do pick at certain corals can someone list what corals specifically?

Thanks!
Blake