I have become the keeper of a tiger derasa about the size of a football. There was a fire and the tank he was in is no longer. So this stork "firefighter" brings the clam to my office. He is in a 65 gallon (170gallon total water) and is under a 175w MH. Reading that they like the sand bottom, is it enough lighting for him with only the 175w to be on the bottom. Right now he is perched about halfway up. I have room on the sand bed for him if there is enough lighting