Came down the other morning to find water thrown out of tank and sand bed disturbed at one end and rear of the tank to the extent that all I could see was a bare bottom. Appeared to have been a surge with my RH Wav which wasn't in the programme. The Wav had just been cleaned for the first time since installation. Other Wav no problems. Turned suspect Wav off and now looks like my purple firefish may have disappeared presumably somewhere under the mass of sand that built up in some areas.
I have attached the photos of the relevant graphs and would be interested in peoples ideas on what may have caused this.
You can see where the surge occurs and then drops back down and where I then switch the Wav off
Nervous to switch suspect Wav back on.
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