I bought these Zoa's about two months ago. After a while I noticed a couple of nudibranch so I did a dip (Kent). In the last couple of weeks the tentacles have gotten long. Why is this? Too much light? To much flow? They don't seem unhappy or unhealthy. I just don't like how they look 
My setup: 120 gal, 40 gal sump, ER 180, Vortech pump
My setup: 120 gal, 40 gal sump, ER 180, Vortech pump