Sorry you are having problems...a few things stand out....too low water temp, water quality and possible acclimation issues......
You need to get a thermometer to check the water temp and you may need to get a heater to maintain a somewhat stable water temp in the 76-80F range-this is a tropical fish and they need a bit warmer water and if your room temp is 70F the water temp is most likely cooler than that....long term cool temps can really stress them and compromise immune response that can end in death.....
Then you have water quality issue.....twice a month water changes on a 1.5gal filter tank is not enough to maintain water quality-unless you have lots of active growing aquatic plants
Water changes on 1.5gal filtered tank/without live plants-twice weekly 50% is recommended to maintain water quality
Possible Acclimation issues that resulted in osmotic shock-how did you acclimate to the chemistry/temp between the two different containers.
Right now-if he came in one of the small temporary cups with a lid most Bettas are sold in-use this to QT, get the water temp up slowly to 76F and float him in this cup in the heated tank-then start making small water changes 10% on both the tank and the QT with fresh dechlorinated like temp water every hour for 4 hours today
Tomorrow increase the water changes to 20% every hour for 4 hours on both the tank and QT cup
If you have any tannins-either IAL or dried Oak leaf-add one crushed to the QT and using a 1gal jug of dechlorinated water add about 20 crushed naturally dried Oak leaves or 1 large IAL and use this water for the water changes on him in the QT cup
On day 3 make a 50% water change with substrate vacuum on the tank-give the filter media a good rinse/swish in the bucket of old tank water
Make 50% water changes using the premixed tannin water on him in the QT
Hopefully this isn't osmotic shock and too much damage done so he can recover.....
The improved water quality and increased water temp should perk him up-if not he may need Epsom salt treatment....
Nutrition-good quality varied diet fed in small frequent meals-remove any uneaten food and if you have any mosquito larva-offer a few rinsed for one meal a day.....
Good luck and keep us posted....
You need to get a thermometer to check the water temp and you may need to get a heater to maintain a somewhat stable water temp in the 76-80F range-this is a tropical fish and they need a bit warmer water and if your room temp is 70F the water temp is most likely cooler than that....long term cool temps can really stress them and compromise immune response that can end in death.....
Then you have water quality issue.....twice a month water changes on a 1.5gal filter tank is not enough to maintain water quality-unless you have lots of active growing aquatic plants
Water changes on 1.5gal filtered tank/without live plants-twice weekly 50% is recommended to maintain water quality
Possible Acclimation issues that resulted in osmotic shock-how did you acclimate to the chemistry/temp between the two different containers.
Right now-if he came in one of the small temporary cups with a lid most Bettas are sold in-use this to QT, get the water temp up slowly to 76F and float him in this cup in the heated tank-then start making small water changes 10% on both the tank and the QT with fresh dechlorinated like temp water every hour for 4 hours today
Tomorrow increase the water changes to 20% every hour for 4 hours on both the tank and QT cup
If you have any tannins-either IAL or dried Oak leaf-add one crushed to the QT and using a 1gal jug of dechlorinated water add about 20 crushed naturally dried Oak leaves or 1 large IAL and use this water for the water changes on him in the QT cup
On day 3 make a 50% water change with substrate vacuum on the tank-give the filter media a good rinse/swish in the bucket of old tank water
Make 50% water changes using the premixed tannin water on him in the QT
Hopefully this isn't osmotic shock and too much damage done so he can recover.....
The improved water quality and increased water temp should perk him up-if not he may need Epsom salt treatment....
Nutrition-good quality varied diet fed in small frequent meals-remove any uneaten food and if you have any mosquito larva-offer a few rinsed for one meal a day.....
Good luck and keep us posted....
