For my 20g tank, I keep a 3 gallon bucket of RO
water for top off during the week. On Fridays, I pull 3 more freshly made gallons and put it into a clean mixing bucket, add salt, a powerhead (maxijet 400) and a heater. I do my PWC
on Saturday, about 24hrs after I mix the water.
What I'm noticing is that once I've added all the freshly mixed water, there appears to be a fine layer of brown "dust", which I'm guessing are diatoms as they wash right out, on the bottom of the mixing bucket.
I keep the RO
buckets covered at all times, and the mixing bucket is likewise covered during the 24hrs between mix and use. Could the diatoms be "Klingons" on the internals of the powerhead or in the nooks/crannies of the heater (ie, near the adjustment dial, etc)?
The powerhead and heater are stored out of water during the week when they're not being used, so I would have thought that 6+ days of being non-submerged would have killed the buggers (although I'm sure the internals are still damp). If this isn't the case, what's the easiest way to get the powerhead and heater cleaned of them, so they don't get reintroduced into my DT? Is it better to store the equipment submerged in RO
water even when not in use?