What are the best snails to get

[kyarnkid]

I have ten Astraea Conehead Algae Snails right now in my 55 gallon. I was thinking on getting better ones. Mainly because the snails I got are not doing their job that well. They are always falling off the side for no reason and they are always sleeping or either never have there mouths out. My water quality is good so they should not be weak and they all still move around.
I was thinking of trading them in for a couple Red Foot Moon Algae Snails or some Trochus Snails. Is this a good idea or are the snails I got ok. What do you all think is the best type of snail to get. I want a reliable cleaner with some life to him.
Thanks Guys

 

[whipple]

go with the Trochus they eat like pigs

 

[fshhub]

i love the trochus for algae,a dn nassarius for the dotritus

 

[kyarnkid]

Can anyone give me some more info on these snails and how good they are?
Turbo Snail
Red Foot Moon Algae Snail
Bumble Bee Snail
Cowrie Snail
Margarita Snail
I saw them at petwarehouse.com, I was wondering if anyone has any of these types?
Thanks