I have a red & white dragonet. It's been able 2 months since I've had him. He was all over the tank at first but know since these past few days he looks slumpy and pale in his color. He's kind of stuck on one spot and barely moving around as he use to. My water perimeters are fine. The rest of my fishes are fine too. Water is crystal clear. I feeding them flake food once a day, is that okay. Any one have any suggestions. I don't want him to die on me.