Do you have any idea of the water hardness or the total dissolved solids of your water? Mollies in general like their water high in mineral content with a pH over 7.5 at all times. If you can get those numbers easily, they may make a nice addition to any tank. I really enjoy my mollies but my water makes mollies easy. Other people, with softer or low pH water, do great with things like neons or angels but not so well with mollies. It is always best to match the fish to the water that you have from the tap. That way you are not constantly fiddling with water, you are just enjoying your fish.