MikeC,
Since you didn't specify wheather you asking about the smaller angels (flame,etc) or the larger angels (emporer, blueface, etc), we've had very different results with each. The flame has never bothered eaten any shroom, ric, lps or zoo that we've seen (It did pick at a small piece of acro though). :sad: On the other hand the larger angel (emperor in this case) has changed appetites as it has matured. We originally had shrooms, rics, frogspawn, and leathers in the tank. After it and the tang and clown trigger returned to the tank from a hypo treatment about 2 yrs ago, the angel decided one day that it liked the frogspawn and we got it out after loosing 1 head as a 'snack'. Then, our toadstool mushroom got picked on and the angel would tear it apart and share it with the trigger. :? . We had earlier tried a kenya tree and it disappeared in about 1 day. I assume anthella, xenia would be equally tasty treats. The angel nor the others have shown an interest (yet) in any of the pink/blue rics or any mushroom of any kind. HTH
Doug