Just got a new betta (male halfmoon) about 2 and a half weeks a ago. He was super happy at first (to get out of that tiny cup Petco puts them in), he was swimming around a lot but didn't seem like he was eating much. In the past week in a half he appears lazy. He hangs out at the bottom sometimes laying partially on his side and will only come up for air. Since yesterday he has been hanging out at the top of the tank, his fins are all spread out which I always thought was a good sign, whereas when he was on the bottom they were somewhat clamped. I don't know what to do for him, everything seems perfect (eg water conditions).
What size is your tank? 7.5 gallons
What temperature is your tank? we put a heater in there less than a week ago thinking it would help him; it makes the water 5-10 degrees warmer than room temperature; I have to get a thermometer
Does your tank have a filter? yes; it's a Fluval Chi
Does your tank have an air stone or other type of aeration? we put a little air stone in there
Is your tank heated? just as mentioned above
What tank mates does your betta fish live with? two zebra snails; there was an amano shrimp but he crawled out; they do not come in contact with DaVinci (our betta!)
What type of food do you feed your betta fish? Betta pellets
How often do you feed your betta fish? 2-3 pellets twice a day
How often do you perform a water change? 1/3-1/2 partial water change a week.
What percentage of the water do you change when you perform a water change? full water change every 2 weeks
What type of additives do you add to the water when you perform a water change? betta drops to make the water safe; haven't used aquarium salt since we got him, maybe I should?
Have you tested your water? If so, what are the following parameters?
I did test the water Sunday; everything was within normal range except the water seemed a little hard.
Symptoms and Treatment
How has your betta fish's appearance changed? I feel like he has a tinge of yellow on his belly (I think it was white there so it's hard to tell)
How has your betta fish's behavior changed? not happy and swimming around too much
When did you start noticing the symptoms? a week and a half ago
Have you started treating your fish? If so, how? haven't treated him, just did partial water change and added heater
Does your fish have any history of being ill? none
How old is your fish (approximately)? just got him, he looks young
This is not him but what he looks like; maybe the goldish under his belly is normal?
Any help/ideas would be much appreciated! I want a happy betta!