All about taking your time and learn, I started off with a 28g nanotube, I learned about the cycle (nitrate, nitrite, ammonia)...I waited 2 week before putting in a clown fish, make sure I keep it alive for 2-3 weeks, make sure all the level was correct, learned about water change(bi-weekly). It was 2-3 months before I put in my 1st coral(zoa). With your mushroom I think they will be fine, but all about learning the hobby... it is slow process and I wanted to add a lot; but worse part of hobby is tank crush or seeing a coral that you paid $50-$75-$400 or whatever dry on you and your hard earned dollar down the toilet. Take your time and learn...best advice I got when I first started 3 years ago.