They are hardy. I've never lost one to disease (but 1 > 10" to fighting). They don't eat algae (they are carnnivores). They are fairly peaceful with others (except L114) I have 4 together in the same tank. Feed them NLS and spirulina for fast growth.
You may want some API General cure on hand, or easy access to a LFS, if this fish develop some parasite or fungal issue from the stress of shipping etc (or were they quarrantined by the vendor?): http://www.apifishcare.com/Products/Product.aspx?ProductID=62