well my 55g is acrylic (just happened to find a good deal on a used one) but my main ups and downs are as follows
-harder to clean i have to use my safeway club card the magnet scrubber scratches
-cant keep chitons or urchins as they mark up the acrylic and may eat a hole right through it given enough time
+lifetime guarentee to never break or leak helps me sleep well at night (clarity plus brand)
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