How long could a male umbriferum live in a 150g tank (5x2x2) before it would need a larger tank? i currently do not have room for a larger tank but should be able to purchase a larger tank within roughly a year or so in which case i will probably go for a 6x3x2 for the single fish. I currently have an empty 150 and have a craving to get an umbee. any opinions/advice would be much appreciated