Absolutely not. Do not allow any part of a heater to make direct contact with acrylic. It's bad...I tested it. If you use heaters in an acrylic sump ensure that they have spacers all around so that they cannot make direct contact.
Mind you...my heaters are 500W..so maybe smaller ones can do the damage mine can (and did).
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400 gal reef. Established April, 2007. 3 Sequence Dart, RM12-4 skimmer, 2 x OM4Ways, Yellow Tang, Maroon Clown (pair), Blonde Naso Tang, Vlamingi Tang, Foxface Rabbit, Unicorn Tang, 2 Pakistani Butterflies and a few coral gobies
My Tank: http://www.canreef.com/vbulletin/showthread.php?t=28436
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