I thought US gallons were the accepted 'standard' unit of volume when talking aquariums, including the min. size for a betta? Recently, I've seen a few posts mentioning it's UK gallons, which is quite a difference.
What is more, 3 US gallons or 3 UK gallons? Mine is 3 US gallons and think it's too small for a betta (but too late now as mine has settled in). My female in the five seems most happy.I thought US gallons were the accepted 'standard' unit of volume when talking aquariums, including the min. size for a betta? Recently, I've seen a few posts mentioning it's UK gallons, which is quite a difference.
Well the tank i bought recently is stated as: 3USG & 2.87UKG, seen as im from the uk i go with 2.87, i will be keeping a betta in this. Its the minimum i would ever go though.What is more, 3 US gallons or 3 UK gallons? Mine is 3 US gallons and think it's too small for a betta (but too late now as mine has settled in). My female in the five seems most happy.I thought US gallons were the accepted 'standard' unit of volume when talking aquariums, including the min. size for a betta? Recently, I've seen a few posts mentioning it's UK gallons, which is quite a difference.

Glad yours is happy. The one I have in the 3-gallon heated and filtered seems happy too. I wouldn't move him because he seems content. When I first put him in, he swam up to me and flared at me. lol That's the only time he's done that. I cannot imagine moving him again.Thanks guysRezatii, UK gallons are more.
US gall=3.78litres UK gall=4.5 litres.
I think you're right though, litres is far less ambiguous
I have a betta in a bowl of 13l, just over 3 US gall, just under 3 UK. It's heated and filtered and he seems very happy, active and healthy, so I won't be moving him, I just wondered![]()
indeed! i will say it takes so much diligence from planning the tank to making a filter(i really think its a must in a small tank to DIY sopnge filter. the smaller commercial filters are CRAP) to testing and waterchanges. but i honestly feel that it is absolutley and completely acceptable to house bettas in NO LESS than 2.5 gal of water, heated and filtered of course! 4 gal total volume and up and you dont have to worry so much about the layout and maintenance...i have stats to prove this as i keep very good logs...that goes for divided tanks.3 UK gallons is my personal lower limit, but I accept that some people successfully keep their bettas in smaller tanks. I never like to see a betta in anything less than 2.5 US gallons as they become much harder to heat and filter, and the water quality if often really unstable. Plus there is much less space for decor to stop them getting bored.