Well, my peaceful community tank has been going swimmingly (pun intended!) for over a year now. I'm really happy with it and I don't think I want to change anything at this point... so I'm now looking at the two empty 20 gallon highs I have. I have a bad cold and have been spending most of my time in bed thinking up a plan for these tanks. Now i need to expert opinions. What I would like to do is have a lot of male guppies and then a pair of either rams or kribs. My water is very hard, so I think the kribs would be better. I realise the kribs will be very agressive when breeding. I realise that even when not breeding the kribs may devour the guppies. I realise the guppies may devour krib fry. I would use the other empty 20H to raise the surviving krib fry which would then be sold/given away. The tank would be heavily hardscaped and will probably have some plants (though I want to keep the plants to a minimum in this tank). I would introduce the kribs after the guppies had time to settle in and grow a bit. So my question to you: Am I out of my mind? Is this setup possible? I'm drooling over the idea of this tank (so much colour!) but I want to make sure it is actually plausible. If it could work, how many male guppies would fit (for lack of a better word) with a pair of kribs. The tank will be filtered with 2 HOBs, one rated for 30g and one rated for 20g.