Just look on this this site for their cleanup crew packages. They have pre-built packages you can order and they tell you what size tank their for. As for the predators make sure they arent going to eat your cleanup crew.
For a 60 gallon tank you are going to want about 25-30 hermit crabs (the cleaner kind: generally blue or red legged). You are also going to need snails. For this I recommend either about 25 astrea snails, or my favorite: 5 or 6 mexican turbo snails.
Is that enough?
I found this sites packages, some are money savers, others are not.
I just didn't want to spend more than half of what they are asking for.
Your list is a little more compact.
Thank you for the responce.
Yeah, I want a trigger eventually too.
So far I meant a P. puffer and a lion (both very small right now).
The tank will be for them in 2 -3 months.
I was think the cleanup crew would be helpful bofore there relocation.
if your going to have a trigger i would be careful on the snails and starfish if you get any i would say a longspine urchin is really good for a clean up crew for a semi-agressive tank