My senegalus is surfacing more frequently (once every 5 mins or less). Is there a reason for this? How often do your sengs surface for air? I'm worried that this may be a sign that water quality is deteriorating, and I just did a 20% water change 2 days ago. He has been eating more lately and getting more food, so there's more debris on the bottom. He's getting noticeably plumper too, so I'm wondering if that's a factor. In tank is just gravel and a clump of java moss he likes to hide in- should I go bare tank? Bare bottom?