As a person that has kept anemones for years, like you I was curious about keeping a mag anemone. Unless you have great stable water parameters, good flow and light like others have mentioned and have a tank that can ultimately support their size...I would choose something a lot easier. I can tell you from personal experience they are extremely difficult to acclimate but once settled they should be fine. It can take them a while to come around. I would only treat it if you see the cycles of deflating otherwise treating with cipro will cause it to bleach...which is another setback. I would also place it on its own island...if the anemone can feel or detect a path somewhere higher.... its going to move.
I have an entire thread on my journey...but ill share the collapsed version. FYI This anemone is in a reef tank with SPS colonies...just for point of reference
Acquired this purple mag on 03/05
Started cycles of deflating 03/05 -03/08
Started treating it on 03/10
Anemone looked terrible and ultimately lost most of the zooxanthellae
back in the tank after treatment 03/19
Over the next several months...it lost its color as mentioned earlier and it lost its size....
In its weakened state, i had to feed it and make sure the clowns didn't steal its food. Although that doesn't sound like a big deal..... it was...at this state it was very weak and eating extremely slow...like 45 minutes slow....and had to keep the clowns away while it eats every day! That's the commitment needed.
This is the nem today...not fully recovered but well on its way. It eats and is strong enough keep its food...have started growing again and its getting its color back. Remember I acquired it in March and its Oct!!! Just know what you are potentially asking for...