As some of you may be aware, I have a yellow tang and cherub angel with HLLE. I also have seen the potential start of it on my regal angel. There are a few general theories of why this may be occurring, including carbon use and diet. I have been using Selcon now and a more varied diet with my fish for a number of months and haven't seen any real change. I haven't been running carbon now on my tank for quite some time (been at least 6 months). Things don't seem to be getting worse, but they also don't seem to be getting better. The fish appear healthy and otherwise eat like pigs and are fatties.
Another potential theory on the cause of HLLE is stray voltage. A more proper term for this (after reading what I just read) may be tank current, not voltage (given that voltage is a potential, and current is the actual flow of electrons). This article I'll link to below suggests that it is the current that runs through our tanks that may be harmful to our fish and corals, and not stray voltage. The article suggests that by using a grounding probe, one might actually create an avenue for current to flow through the tank, were one did not exist before without the grounding probe. However, removing the grounding probe may create a situation where the tank is less safe to the reefkeeper. So, how is this balance achieved - safety for the keeper, and lack of current flow through the tank to the benefit of the fish/corals? How would one go about ensuring there is no current flowing through the tank, other than ensuring all equipment is newer, undamaged, and in decent working order? Reason I ask as I want to ensure there is no current going through my tank that doesn't need to be, but also I want to be safe. The only potential source of problematic current I can think of, other than skimmer, powerheads, reactor pumps, heater, and return pump lol all of which are regularly maintained and working well is my T5 lighting. I sometimes feel a bit of a buzz over my reflectors, but they aren't contacting the water, although they may be contributing current to the water and creating a path through the grounding probe? They are DIY'd and have always worked fine, but I wonder if there is more I can do to create a current free water situation. I've never felt anything in side of my tank.
Here is the article on grounding probes and current: http://angel-strike.com/aquarium/GroundingProbes.html
Anyhow, seems like there are quite a few on here who are gifted electrically, both from a practical and theoretical sense, and thought it was worthy of a discussion. Any insights are greatly appreciated on tank current, grounding probes, and of course using a GFCI as a base of one's tank electrical centre. Hopefully others like me who have a relatively poor understanding of electricity can benefit from it also.
Another potential theory on the cause of HLLE is stray voltage. A more proper term for this (after reading what I just read) may be tank current, not voltage (given that voltage is a potential, and current is the actual flow of electrons). This article I'll link to below suggests that it is the current that runs through our tanks that may be harmful to our fish and corals, and not stray voltage. The article suggests that by using a grounding probe, one might actually create an avenue for current to flow through the tank, were one did not exist before without the grounding probe. However, removing the grounding probe may create a situation where the tank is less safe to the reefkeeper. So, how is this balance achieved - safety for the keeper, and lack of current flow through the tank to the benefit of the fish/corals? How would one go about ensuring there is no current flowing through the tank, other than ensuring all equipment is newer, undamaged, and in decent working order? Reason I ask as I want to ensure there is no current going through my tank that doesn't need to be, but also I want to be safe. The only potential source of problematic current I can think of, other than skimmer, powerheads, reactor pumps, heater, and return pump lol all of which are regularly maintained and working well is my T5 lighting. I sometimes feel a bit of a buzz over my reflectors, but they aren't contacting the water, although they may be contributing current to the water and creating a path through the grounding probe? They are DIY'd and have always worked fine, but I wonder if there is more I can do to create a current free water situation. I've never felt anything in side of my tank.
Here is the article on grounding probes and current: http://angel-strike.com/aquarium/GroundingProbes.html
Anyhow, seems like there are quite a few on here who are gifted electrically, both from a practical and theoretical sense, and thought it was worthy of a discussion. Any insights are greatly appreciated on tank current, grounding probes, and of course using a GFCI as a base of one's tank electrical centre. Hopefully others like me who have a relatively poor understanding of electricity can benefit from it also.
In hindsight I should have just installed a GFCI back then, but I was sort of in a rush to get things back up and running. 
