Originally Posted by Byron
From the data I see some stress from the low pH, low for livebearers. The GH is not given and that is equally if not more important. Molly in particular are highly susceptible to soft and acidic water, they absolutely must have harder water with mineral. Shimmying, fungus, eratic swimming are all signs of water problems, so I would correct that. At the very least it will reduce stress which weakens the immune system allowing for other health problems.
+ one, Mollies need 12 DGH or better for longterm survival ,and fair poorly in less than hard alkaline water.
PH of 7.8 to 8.6 with 12+ DGH would benefit the fish.
Some foks that keep mollie ONLY tank's use a bit of marine salt at perhaps half dose suggested for marine tank's.
Marine salt conatins Calcium,Magnesium, which increases the hardness as well as providing a bit of salt that these particular fishes seem to do better in.
Aquarium salt does nothing to raise hardness but may benefit a Molly only tank.
These fish are in my expierience intolerant of Nitrates in excess of 20 ppm over the long haul.
Someone once asked here..."what is the most unusual fish you have seen?"
I replied .."Adult Sailfin Mollie" which can get quite large but you seldom see them this large for they increasingly die prematurely.