Hello all, I've been lurking for a while and now I actually have a question. I have had a 5g tank for about 7 months now in which I currently have 2 ADFs, the second being a new addition within the past 3 weeks. She's been doing great up until the last couple of days, where it seems to be a struggle for her to stay on the bottom. She fights to stay down but seems to keep rising to the top, trying to hide under leaves to stop her ascent. Then she'll get tired and float right on the surface before trying again. The thing is that she has lots of energy and still has a voracious appetite, so illness doesn't seem to be a factor. Any ideas as to what's causing this???