Is 20 litres to small for a Betta

[MarkOne]

Try ebay etc...

 

[jungle king]

Ebay would be fine if I had such a thing as a credit card or was able to travel hundreds of miles .

But doing the 30 gall cheaper got me thinking. My 30 gallon tank that my goldfish are in cost about £25. Elite stingray filter cost just over a tenner. What heater would I have to get ?

 

[jungle king]

would like to know what wattage heater I would need for a 30 gallon as i am going to the fish place later today to look at some tanks and price some combos.