Why are they considered hard ? Can you have a clam in a 24 gallon tank? Can you have a clam under t5s with blue leds? I have stayed away from them seeing i have only been doing this for less then a year.Also i am still in my starter tank with t5 50/50s and blue LEDs. Today i went to my LFS who has a new jbj tank set up with the same lighting and they have two clams in the tank and seem to be doing well.I asked about it and the guy snickered and said clams are not as hard as everyone makes them out to be. So whats your take on this?