I've never been poisoned from handling mine, but I'd waste no time washing if I got some sap on my skin.
pothos doesn't need much light, but the point to adding it to your filter system is to filter, and for that more light is better. instead of putting it in a HOB on your sump, just root it in the sump and use that power that would have gone for the HOB for some lighting.
here's mine so far.
grows out of the overflow, down to the floor, does a loop, and back up. it's about 12 feet at this point.
pothos doesn't need much light, but the point to adding it to your filter system is to filter, and for that more light is better. instead of putting it in a HOB on your sump, just root it in the sump and use that power that would have gone for the HOB for some lighting.
here's mine so far.
grows out of the overflow, down to the floor, does a loop, and back up. it's about 12 feet at this point.