Spreads well in the tank. It's a soft silicone that wobbles slightly as it flows slowly in the tank. We love it. Looks great with the lights on and only blue light. We have a Glofish brand 6 inch blue LED light bulb and it glows well with it. Also looks good during the day with regular LED lighting. I'll let you know if anything bad happens. If not then know this is a great buy. Photos must only show LEDs, LEDs and blue and only blue. My phone camera doesn't catch pink spikes in low light. .
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