Thanks you guys for your input so far. This is exactly the reason that I decided to ask some suggestions on this site...the variety of information and ideas. My danios do seem a little nippy - not unfriendly with each other, but they chase each other around like mad and seem like they may be a little too "playful" for a very "finny" fish. Yes, I love my gerbils! They have an intricate maze of tunnels and compartments...they're very happy. And don't worry, my comets are not even close to 12 inches!! When I got them they were the size of my danios, and I'm just amazed that they are now a solid 1 1/2 or so inches. And I'd sooner expand to accomodate my growing friends than give them away! They're survivers! And they're totally awesome aside from the fact that they eat my live plants down to nubs. They're full of personality, and will even come out of the water a little when I give them their flake food and nibble my fingers.

My water quality in my 10 is always excellent, as I keep on top of the situation and check it often (as I stated, I am aware that it is overstocked). As far as my hex goes, the substrate is gravel, a little on the fine side, but still gravel. And it's live planted. If I have to eventually expand for my golden friends, I'll have to keep the frogs with them...they're a little family.

Keep the comments coming!