As African cichlids tend to be bottom dwellers for most of the time, i would think they would be fine with a hole in the lid.. and indeed, i have seen a couple of people keep them indefinately without lids.
And thanks to you too, kiriyama! As far as the tank, it's a 60 gallon all glass with Penguin Bio Filter 330 (older version I think), and currently running an Aqua Clear 70 for now. The AC is going on my sons' 29 gallon soon. As far as the fish, they are African Cichlids of some sort! I'm hoping someone here can help me identify what type and what sex they are. I bought them as you see them with little information about their identification.
thanks again dthoffset! We are really loving out tank the African's! And I really get what you're saying about them being really into their food.. LOL I wouldn't wanna be a source of food in the midst of these hungry critters..