My only male molly fish that lives in a 20-gallon with 2 small shrimp, a few small snails, a bristle nose pleco, 3 female mollies (two of which are his daughters), 2 male guppies, 4 baby mollies, and 6 tetras. Around 2 weeks ago I saw him sitting at the bottom of the tank barely moving. The day before he was super active and trying to mate like always. I did a water change and also reduced feeding by 30% in case it was due to overfeeding. I also fed some green peas to all the fish and put some salt in the aquarium. A few days later he wasn't on the floor anymore but now he stays almost always at the top of the fish tank and doesn't even bother to go near the females which he always used to do. There's enough oxygen and I don't think he's eating biofilm. The other fish do not exhibit any of the strange behaviours of the male molly. Could it be an illness? Currently, I am using Tetra Lifeguard to see if he gets back to normal but I am only using it at 75% potency relative to dosage for my tank size.
Info:
Nitrite, Ammonia, and Nitrate levels are all at 0
Ph and Hardness are optimal for all fish in the tank.
Chlorine is 0.
I have an airstone for oxygen
I Feed 2x a day
I also use a filter that goes up to 35 gallons.
The male is around 1.5 - 1.75 years old.
Additional Question
Why does my female molly do this? She has done this almost since we first got her. She has never been sick and she is currently healthy. She does it a few times per day.
Info:
Nitrite, Ammonia, and Nitrate levels are all at 0
Ph and Hardness are optimal for all fish in the tank.
Chlorine is 0.
I have an airstone for oxygen
I Feed 2x a day
I also use a filter that goes up to 35 gallons.
The male is around 1.5 - 1.75 years old.
Additional Question
Why does my female molly do this? She has done this almost since we first got her. She has never been sick and she is currently healthy. She does it a few times per day.
