ultrasonic sound waves

[vjvl51]

We have a couple of ultrasonic level sensors that we were planning on using on the tank and on the sump. These senors use ultrasonic sound waves to detect water levels, so nothing would actually be in the salt water. If the levels changed drastically, the power to the pumps would be turned off and an alarm sound, hopefully preventing overflows. My question is, does anyone know if the ultrasonic waves would have any effect on corals/fish/livestock?

Thanks

Vickie