Originally Posted by herefishy
Which crayfish were you looking at? there are some that are harmless to fish. Some of the Australian Yabbies, despite their large size are quite docile. I wouldn't necessarily suggest you get the yabs, but to let you know there are 'dads out there that can be placed in a community setting.
I do agree with nixing the Bala's. They do get large and will eat smaller fish. I alos think that they are a little more sensitive to poor aquarium management as well as water conditions.
Since I posted this, reading the responses and talking to others, I have nixed the Bala's and in stead will go with 3 Tiger Barbs. Most have suggested for Bala's to be pretty much by themselves in a 100 gallon tank or more as they will get very large. So I decided to go with the Tiger Barbs.
As for the Crayfish, I'm looking at the generic regular "Red" crayfish (it looks brownish/grey) such as this: http://www.liveaquaria.com/product/p...72&pcatid=1872
Everything I've read and discussed with people says they are peaceful and keep to themselves, and would only be a threat to smaller, weaker slow fish (Such as the neon tetra) . All the schooling fish I have listed to get are little bigger, all being about 2 inches, with the barbs getting to 3, and inhabiting the mid to upper levels away form the bottom.
They are also pretty fast and should have no trouble getting away it should it get aggressive. I also have plenty of cracks, crevaces and hide aways planned for all. But as I said, everything indicates that the crayfish would be peaceful.
Should it become a problem, I've thought abut removing it and putting in 2-3 ghost shrimp, but I'm fearful that the Red Tailed shark will go after them when it gets bigger. Would that happen or do they tend to leave inverts alone? I have a Ghost shrimp right now in my 10 gallon with a yo yo loach and 7 Glow lights and everyone gets along fine.