Much agreed, tenuis hate alk swings and enjoy feedings. Walt Disney is a pretty easy tenuis IMO. When you say your having success with other acros how long have you had them? Are we talking you put in frags a month ago and they are surviving or your able to grow to colony size?Tenuis need higher levels of available nutrients than most acropora ime. That does not mean that you should try raising your levels, but maybe add some more fish or feed meaty foods more often. Also, as stated above they do not do well with KH swings (in general) there are some Tenuis that are hardier than the rest.