, I would suggest a Brittle star as the easiest to keep. I purchased mine @ about 5-6" leg to leg... he is now likely over a foot leg to leg. He will simply scavenge bits of food, algae or other matter from the floor of the tank and off the LR
. They are not aggressive nor have any other bad qualities that I can think of. Not that they are an especialy shy invert and will spend 99% of their time under/behind rocks with only their legs sticking out. That other 1% of the time is at night when they're moving to hide under a different rock
I have heard linkia's are not particularly easy to care for. I have only kept one, It appeared fine for about two months, then I never saw it again. I completely expect to find it in a wall some years down the road, i never even found the body. I just one day realized... where's the linkia?