Has anyone else had this happen ? It appears that one of our Vortecs suddenly went to full speed (from a setting of about 75%, give or take). I really cannot tell the exact speed it went to since there is no way to measure it outside of the reaction of your tank's environment. In our case it stirred up a huge sand storm, buried a clam, a couple of rather rare/expensive chalices (Bazooka Joe and Rasta) and just caused general water quality issues. It happened during the afternoon, when nothing else was going on within the tank (IE: no maintenance, etc). I originally thought that a fish had gone to digging except that once I got the tank cleared enough to see what was going on I could see a 2" trough in our sand bed and the sand granules on the surface of that trough were moving with the current. It is important to note that this has all been set up and running (With the current speed settings) for several months. About 1 month ago I cleaned this particular wet end because it kept stalling. The cleaning did not help with the stalling. I throttled back this one Vortec to about 50% (give or take) and everything again quieted down within the tank. This was this past Saturday. Curiously enough that Vortec has not stalled since then. I find that odd since it usually takes turning a pump speed up to get it to stop stalling, not down 
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Luckily I was home when it happened, so that I could minimze impact and not lose any livestock (that I am aware of). I shudder to think what would have happened if we had been away for the day, or worse, the whole weekend.
Anyways, has anyone else had a similar experience ? I thought I had read some time ago about this happening, but I couldn't find anything with a search (hard to come up with good search parameters that didn't return dozens of irrelevant hits).
.Luckily I was home when it happened, so that I could minimze impact and not lose any livestock (that I am aware of). I shudder to think what would have happened if we had been away for the day, or worse, the whole weekend.
Anyways, has anyone else had a similar experience ? I thought I had read some time ago about this happening, but I couldn't find anything with a search (hard to come up with good search parameters that didn't return dozens of irrelevant hits).
