My acrylic tank is 5/16" and I have no issues at all. When set to full throttle it get pretty warm but not to hot to touch. When feeling around the tank around the vortech, I could not feel any heat coming from pump. I think the spacers do a good job.
If the pump does get to hot for some reason. It has a safety shut down feature to cool the pump down and when its cool enough it turns right back on.
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