[Not sure where to post this...
I have a HM TDS meter I got off of ebay. I want to calibrate it but lost the instructions for it. I searched on-line with no luck. Anyone have a TDS meter like this?]
[i've been reading gravit's skimmer thread for his 55g and wanted to ask for some suggestions for a 180g i was going to setup. orginally i was going to go with a ev180 but i'm afraid it's too small.
the guys at tranquilscapes sell a trigger systems skimmer. they say it's pretty good for the...
[I have some blue barrels at my work that have food grade propylene glycol. Would these be ok to use as water storage tanks? If so, what would be a good way to clean them out?
Thanks.]