I'm pretty sure there's high nitrates in his tank. Phosphate is a definite possibility. He has bio balls in his wet/dry and is very lazy to remove to bio balls. He has a remora hang on and it works well.He does his water changes once a month maybe about 4 gallons at a time.He is using ro/di water. He leaves his lights on very long from 11 to 7, but I told him to decrease that. His tank is in front of curtains but the curtains are always close, but I still think the sunlight still penetrates in the tank somehow. Tank is about 4 months old. Feeding probably once a day. Additives, I'm not sure. He is using some kind of phosphate thing to remove phosphate. That's all I kind say. Pretty much I'm disapointed in my friend. He has a very busy life andit's hard for him to maintain it. Then again he loves to sleep his life away. Wouldn't wake up early to take care of whatever needs to be taken care of. He says sleeps come first. That's BS right there! The guys sleeps an avg of 10 to 12 hours a day.