Anoerobic pockets? Sand is warm to the touch... - Page 2 - Tropical Fish Keeping - Aquarium fish care and resources
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post #11 of 12 Old 08-27-2009, 12:45 PM
Does your tank have a heater? If so its probably residual heat energy from the heated water. Its the same concept like when your at the beach, when it gets dark and cooler the sand is usually still warm for a while before releasing all of its energy. The sand at the top is probably not as warm to the touch because the heat energy it absorbs is constantly being altered by the flow of water over it but the bottom has less currents so the sand can absorb more heat energy and retain it.
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post #12 of 12 Old 08-28-2009, 09:08 AM
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Originally Posted by nomel View Post
I stri my sand to qet the debris up into the water where it can be caught. My question is what is causing the heat. There isn't anything warm under my tank.
Actually don't do that. You want to vacuum the stuff directly up off the sand. Stiring it up only makes it more likely that it will get buried in the sand. Just wave your siphon gently back and forth over the sand. That'll create enough current to pick the stuff up off the sand without moving it around.

Like Sin and I said, sand is just an insulator, its naturally going to be warmer down near the bottom.

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