Hi there. I am hoping to get some help with one of my Bettas. Back in November my 2 kids were given a Red Betta and a Blue Betta as gifts. They started out their life in our care in 2 separate 2 gallon bowls with some gravel, plastic plants and decoration. From the beginning Red Fish thrived, was happy in the bowl, almost doubled in size has gorgeous long fins and made bubble nests. Blue Fish struggled and lost weight, started losing chunks of fin.
So... after doing some reading online we decided to move them to separate 5 gallon tanks. (We talked to the pet store, followed all the directions, etc.) Red Fish thrived in the new tank just like in the bowl. Blue Fish perked up for about a month, grew back some fin and then stopped eating pellets completely. We tried several brands. The only thing he now eats is Dried Blood Worms and not very much. He developed yellow spots. We moved him back to a small bowl and treated him with drops for a week, completely cleaned his aquarium and returned him to it. We were told the small tanks might not be warm enough on the counter with lights only so we added small heaters to both tanks.
Red Fish continues to thrive no matter what changes we make and Blue Fish constantly looks like he is dying. His tank get a yellow fuzz in it and gets murky and cloudy almost immediately after water changes, cleaning and most recently after a complete change and thorough scrub. His fins are starting to stiffen and they are very ragged. He is thin and does not eat much. As far as I can tell, both fish are in almost identical environments and one is thriving and one is barely hanging on. It makes us feel sad and frustrated. Taking care of these fish has been way more expensive and time consuming than I could have imagined but we've grown to enjoy them and I want to help Blue Fish. Is there anything else I can try?