My first tank was 15 gal. It came with a dozen red Platies,but I wanted some variety. After giving half the Platies away, I added a couple Dalmatian Mollies. The store clerk told me these two species like brackish water. I added a pinch of SEA salt, which makes the water harder and brackish...
I had a Red Serpae Tetra who swam as if on a pogo-stick. Never swam horizontally or stopped to rest. Expert at Petco told me it had swim bladder. They get it when they come to the surface to get a piece of food and at the same time take in a gulp of air. She advised dropping the food where the...
I had a red minor Serpae who was near-vertical and bouncing around the 29-gal. tank as if on a pogo-stick. He seemed to tire before reaching surface food. Glad to know what its malady was. I chose to humanely relieve its suffering, because it was slowly starving to death.
My personal preference...