Hello I was recently asked a question and was hoping someone could give me a yes or no answer to. Can you have too few fish in a tank? A friend asked as he lost most of his fish due to a faulty heater and has ended up with two small fish in his 100gal tank. He’s getting a lot of rubbish landing on his live rock and was wondering if he should add a few more fish to pick over the rocks. I’m not sure how to answer this as I know you can definitely overstock but not sure what under stocking would do.