This is going to be kind of morbid but one of my betta fish is on his last leg & I wanted some advice on what kind of betta I should get next. My dying betta is in a 5.5gal heated, filtered & cycled all by himself. He started showing a tumour in early august & has been doing fine but in the last week he has really deteriorated & I don't think he will make it overnight . I plan on doing a deep clean of substrate & changing about 50% of the water after he passes. I want to get a new betta right away so that the cycle doesn't get messed up & so new betta has a happy clean home with no ammonia . I'm just soooo indecisive about what kind to get & where to get it. I currently have a crowntail male, veiltail male, & veiltail female betta, all are in their own tanks. I'm trying to decide between a doubletail male, halfmoon male, or one of those "king" bettas(from petco). I was thinking of either going to the pet store by my house(a small chain) or going to petco. Both have pretty nice fish but the local one has less stock & seem to take more individual care with them. Does anyone have any experience with doubletail/halfmoon/king & have any advise?