When was last water change and how much: 25% last night an then the Prime added my water is natural spring water no chemical to it straight from spring to house with filter on it.
If using natural spring water why the need for Prime ?
Saying you are using natural spring water (but not knowing your locality),I'd say that it's a safe assumption that you have either ammonia,nitrites,or nitrates (possibly traces of all three) present. So the test kit should also be used on your water source to test for that. As far as pH being up...how would lfs know what normal ph is for your
tank ? If having them test that much,your own kit is definitely worth the investment.
What type of water filter on the house ?
2 filters with the bio....Penguin 350
Take that to mean that you have two Penguin 350's (pulled it as a split quote). That's barely 700gph on the 110g...so severely
underfiltered. With the stocking,and short time the tank's been up,there lies a large part of the problem....overstocked and
underfiltered while cycling.
Love Os myself but would never consider putting 6 in any
tank,let alone a 110g. They are actually solitary fish that only come together to spawn (and then only as a pair) so throwing them together only creates chances for aggression...plus their messy habits can really tax filters. A 110g is only a 4' tank,and only a half inch wider than a 90g,so it makes its volume off its height...which means nothing to Os....so the floor space won't support 6 fish that should
To solve the issue you are having some easy things need to be done...and some tough choices have to be made. First is testing the water quality through the cycling,second is getting filtration up around 1200+gph,third is large water changes...but these really won't help if you don't trim the stocking back to only two Os.
Far as the Goldfish...besides parasite/disease (and fact you add excess load on the filters),feeding them is
messier than any pellets or prepared food you could feed.Scales and fleshy bits everywhere. If the complaint is how messy pellets are then they are being overfed...and that adds to the ammonia/nitrite problems along with the stocking/under-filtration.