L200 green phantom is actually 2 different fish Baryancistrus demantoides and Hemiancistrus subviridis the latter being the one more commonly seen in LFS. Snowball is Baryancistrus sp. (LDA33), not peckoltia.
All 3 are omnivores so need a varied diet. I have just noticed that you are in leeds mate, by any chance have you been to petcity just round the corner from the corn exchange recently?? Thats were most of my plecos came from, great shop for plecos.
Reason i ask is that Mick has both those sp. in at the moment and the 200's are the barys (the nicer ones imo and rarer) but i bought the nicest one lol