questions on chaeto and RODI

[e46er]

i got an rodi unit about a month ago and i use big rubbermaid containers for storing rodi water and another one for mixing
question #1 it seems when i turn the unit off and the stick my hand in water to put powerhead in i get shocked its a good shock obviosuly its static shock any ideas as to why the bucket shocks me before i drag it across carpet or anything............ the hose does touch the metal door on the furnace room but there is no wires touching the door for stray voltage...........

question 2 a member recently gave me a good chunk of chaeto algae it has some brown spots in it...........here are some pics


is this normal or what is the brown..

question 3 i can see little things moving around on the chaeto are these pods??