I looked at my tank the other day and there is so much crap crawling on the glass and pods flying everywhere that I can probably support a pair of Mandarins at this point. Even snails started laying eggs on the glass. It's amazing what 5 years of proper husbandry can do to a tank.
I still have the original set of Tonga Nassarius snails that I bought about 5 years ago. There may not be 12 left but I counted 5 in one spot. They tend to favor the side on the far end away from the window. Most fish actually sleep in the corner too.
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