Also, for that price, you can go to Petco and buy good NSW from Catalina until you decide which route you wish to go.
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+1 when I was breaking in my skimmer I just ran it as high as I could and took the lid off and just let it over flow for a couple of days. It’s amazing how a little bit of the manufacturing oil can throw it off. Come to think of it my sump was brand new as well and had issues with the water foaming up coming from the dt. Had to break in the sump and skinner separately.Is this the first time you've run the skimmer? If so, it'll probably need to "break in" for a bit, its also typically recommended to run them in a vinegar and water solution just in case there is any residual manufacturing grease, grime or other materials. You'd be surprised how the smallest amount of X can throw (at least small) skimmers for a loop. Try super glueing two rocks together with the skimmer running and watch what happens.
I'd run the skimmer high/wet for the next few days and see if things begin to look better. It took about a week for my skimmer to really start to find its groove.
After about 30 full water changes on my large fw tank using tap, no harm, I had a rascal yesterday run to report. All I can guess is they must have powered up the chlorine I don't know, never really needed test kits so it's my assumption but after a totally routine change -6 neons they looked dazed, contaminated somehow, but all other fish were normal. Floated dead/stunned to the top within 30 seconds after change. Never happened in roughly my thirty years of water change technique...the infrequency of death using the same kind of water change across all my systems narrows this event down to water poisoned somehow/risk of the large volume water change. It needs to be darn reliable sourcing that's for sure, if one changes large percentages
Instantly stricken but only the six weaker smaller ones it seems and during the event I added some freshwater thiosulfate condtnr and the event seemed to stop. About thirty mixed amano and cherry shrimp are running in tow none died, I'd have expected shrimp to go first. I think the whole tank got a chlorine shock and the strongest survived
What seemed to stop the event was this one time extra addition of water chlorine conditioner. /anger at loss of 1/3 of my swirling ball of neons.