I haven't had much problem with flash on the glass, they show up dark when the fish are at the back of the tank. I turn up the iso but don't notice much difference
I have a telephoto zoom I have to stand across the freakin room to take a picture it's annoying, the default lens and another telephoto w/ macro.
I would love a true macro lens but an extra $300 is not something I have just laying around. This camera is actually my boyfriend's he got it used on ebay.