Hermit Crab Problem

[killafins413]

I have two tanks, a 55 and a 20. Its the 20 that i am concerned about. It has a problem with algae and I do not like to use chemicals in my tank and all the nitrate, ammonia, etc. are all perfect. I usually put in turbo snails but my hermitt likes to eat them, he will tear open the bearier and pick at the snail. Soon those ten turbo's a purchased drops down to one who manages to survive for a day more. I tried to feed my hermit a little more food; shrimp pellets, but soon the algae got worst and the hermit wasn't interested in such a puny meal after such a delightful of slimy snails. I also put in two horshoe crabs who molted and then disappeared, i have looked for them when i been cleaning the tank and they have disappeared; which i assuem they have died and decayed already. This hermit also passes a problem with new fish, only the two yellow tail blue damsels and tomota clown (my original fish) know how to keep away from this beast so I can't put in real fish that usually stay away except for night so I assume blennies will be done for in seconds. So please, what new fish can i put in withotu having to kill or remove thehermit... plush how can i cure this algae problem without chemicals and without cleaning it every day. (it isn't that bad but it looks kinda gross).
Fish List:
One Hermit Crab
Two Possible Horshoe Crabs
One Tomato Clown Fish
Two Yellow Tail Blue Damsels

 

[nightraven]

Check your sand for the Horshoe's. They bury themselves in the sand. (I assume you have sand, not CC)
I know this is not the answer you are looking for but with what you have described it would be the hermit taking a trip rahter than building my tank around what can keep away from him.