In your tank, the jet heads are acting like the first (primary) coil and the meter lead is acting like the second (secondary) coil. The medium in between (the water and fish), feels nothing. You can also relate it to a radio receiving signals from an antenna, though it's not quite the same thing.
Your heater is a different story. Imagine taking a piece of copper wire, sticking one end in the hot side of the power outlet and the other end into your tank. This may be an exaggeration (depending on the level of insulation breakdown and where in the circuit it is exposed to the water), but it gives you the right idea. That is a direct connection. Anything that comes in between it and an electrical ground will feel a jolt (or worse).
Why your poor fish is still clamping, I don't know. Hopefully, he just needs some time to recover and will be fine.
And it is recommended to have some sort of cage on it.... I lost a dwarf chain loach (sid) on the weekend. It was amongst a dozen or more loaches that were racing excitedly around the tank after a large water change. Right in front of my eyes they were playing in the flow from the wavemaker powerhead. This extra quick sid swum extra hard and got straight inside the cage of the powerhead.... it got bounced around a few times in the cage and then was spat out by the water flow. Unfortunately it sustained two wounds on either side near its gills, and died a few hours later.Diana wrote:As an alternative power head look into the Koralia product line. More water movement for less electricity.
More difficult to add any sort of filtering sponge, though.
The power head is now off until I can work out a way to enclose it better in a loach proof way (damn guys are always soooo inquisitive and adventurous and will try any little opening).
8ft Clown loach tank: 30+ clown loaches, 10+ Yoyos.
6ft tank for 16x botia kubotai, 13x Striata, 6x Sidthimunki - I need more sids
Another option is to use the Koralia as part of a Hamburg Mattenfilter. There is a lot of info about this style of filter elsewhere, here is one link.
http://www.plantedtank.net/forums/showt ... ttenfilter
There is more info here at Loaches about a similar use for this style of power head.
Happy fish keeping!
Thanks for all your help everyone. Conclusion: NOT STRAY VOLTAGE.
LoL-I guess I should have looked at the dates of the posts
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