TOO cold , the recommended temp. should not go below 78 deg F. try a heater or warmer place. and feed a small amount each day, not absolute , but you seem to have a mortality problem.
you can put a betta in a 54 gallon tank
2 times a week
None. The 1 gallon bowl is already too small for the betta by itself.
No. A betta requires water between 80 and 86 degrees, while goldfish require water between 72 and 78. Also, there is not enough room for these fish in that tank. 2 goldfish should have a 20 gallon tank minimum to themselves.
1 gallon tanks & smaller need to be changed/cleaned every 5 days.
you can put a betta in a 5 gallon tank
no
yes of course! my betta is in a 2.5g and is perfectly fine
it depends i have a male with a female betta, in a 2.5 gallon tank,they get along, i wouldnt risk it, no
Personally, I wouldn't keep anything in a 1.5 gallon tank. Not even a single Betta. I consider 5 gallons to be a minimum for a single betta.
one
Forever.