FYI, In reefing there's a new trend of send your water out for detailed "ICP tests". One vendor, ATI, will also test your RODI water for free with a test (reefers definitely should be using RODI or distilled water) So after getting lots of "your RODI is fine nothing measurable" results, I decided to send Arlington tap water, after it gets to my building. The results were interesting. (those who live in DC and Falls Church IIRC get water from the same plant) Most parameters were zero (even, oddly, nitrates), except for the following: Silicon    3100 µg/l (supposedly from a quick google search "The silica content in natural waters is commonly in the 5 to 25 mg/L range, although concentrations over 100mg/L occur in some areas") Barium    23.49 µg/l Copper    3.37 µg/l. (far below ostensibly dangerous levels, it seems to me from a google search.   Arlington county's 2018 water quality report says that their range of detected levels were 0.01 – 0.19......hmm....... piping problem somewhere?) Zinc    6.45 µg/l Phosphorus    710.3 µg/l     Phosphate    2.17 mg/l Aluminium    21.97 µg/l. (note: according to the WI department of Health, "the World Health Organization has recommended that aluminum levels in community water supplies should not exceed 0.2 mg/L.".  So this theoretically should be fine for drinking water, it seems)  This is obviously not what we want for reefing.  I don't even know if I'd want any of this in a simple freshwater tank, though only phosphate and Al look like they're problematically high levels......

Selling various odds and ends, generally better for FW than my reef tank, here. Starting with: NIB Marlineland 360 Canister FIlter, $60. ($100 at Chewy and even more at the various PetPlaces). I've opened it, but not set it up, because I think it's too big for my intended use. :(. Eheim quick vac gravel vacuum, $20. Didn't work for my purposes. :(. Pickup in Ballston

Hey there, I grew up doing fresh water, and may get back into that later, but right now I'm into a reef (and an SW planted tank). Joining mainly because I've got some stuff for sale and I'd rather sell in a hobbyist group rather than just putting in on CL. :)