Think you REALLY need to watch what you say to people you dont know. The internet is such a wonderful thing, it gives people the ability to say things to people that they would never say to them if they were face to face.
At no point did I declare myself to be an "expert" but I have kept various Dovii for many many years at various sizes both personally and through the shop.
So look at the pictures of my 2 x dovii and tell me that thats not a male and a female at 3" then cause judging by what your saying they are un sexable at this size.....
This forum is FULL of people who have no clue about what there doing at all.
Can a male dovii have a good life in a 180g with good feeding and excellent water quality and the answer is absolutely yes!
Would I use a 180, not for an adult no as I will always give more than is needed, but a 300 gallon tank with 1 fish in it .... eh no matey.
So if you wanna talk please feel free to pm me and I will give you my email address or phone number.
Thanks babe xxxx