So I did a "full" water change two days ago (by full I mean I switched out about 3/4ths of the water, cleaned tank, etc.) and I moved my betta's tank to my daughter's room, which has sun in it the entire day. Before, he was in my room, which is dark all of the time besides his light, which we had turned on.
In our room he was thriving. He looked happy, swam around and loved to "greet" anyone who came in the room. Since the switch, he has drastically changed. His tank is full of goopy white strings, a lot of them attached to the heater. He has been hiding behind the heater and refuses to eat! He only occasionally floats to the surface for air. He has his fins tucked up close and he's gone from bright red to dark. He looks worse than he did when we got him!!! His water is also very thick feeling.
We are using natural rocks in his tank, and I thought maybe they were affecting it. Or maybe our heater is bad? Or the sunlight is too intense for him? Oh, and he is in a 5 gallon tank, small heater, natural rocks, no filter.
I am very concerned, if anyone could help me figure out whats wrong, I'd love any help I can get ASAP.