Although using an aquarium is handy at first, that 'corner' thing is something to worry about. Maybe not with only 11 chicks, though. And the viewing would be nifty - not just from above. But the mess on the glass would make me nuts.
That's why I used a 54 gallon Rubbermaid bin. It was oval-ish (a long oval), I wasn't presented with messy viewing, and it's a whole lot easier to: #1 - swoop out the mess along the sides (no corners), #2 - lightweight and easy to DUMP when a full litter change is necessary. Very easy to clean. #3 - Really inexpensive. Not as cheap as "had it on hand already" like your aquarium, but great for me.
Plus, it made it easy to set up the heat lamp at one end, so there was a really warm end, a warm section and a cooler end for the fuzzbutts to choose what temp they needed at what times. Also, the water stayed cool at the end furthest from the heat lamp. (I've read that chicks/chickens prefer cold water to warm.)
That's why I used a 54 gallon Rubbermaid bin. It was oval-ish (a long oval), I wasn't presented with messy viewing, and it's a whole lot easier to: #1 - swoop out the mess along the sides (no corners), #2 - lightweight and easy to DUMP when a full litter change is necessary. Very easy to clean. #3 - Really inexpensive. Not as cheap as "had it on hand already" like your aquarium, but great for me.
Plus, it made it easy to set up the heat lamp at one end, so there was a really warm end, a warm section and a cooler end for the fuzzbutts to choose what temp they needed at what times. Also, the water stayed cool at the end furthest from the heat lamp. (I've read that chicks/chickens prefer cold water to warm.)