Festae males do get 16" but takes several years. Female Festae get upto 12"... And not saying it is t true, but I've never seen an Oscar over 12".. You could get away with a 75 for an Oscar but more space is always recommended. I've bred and raised a few Festae over the years and I say it is much better to keep Festae pairs in a 125 minimum.. And no, you can't find hiding spots for just the female as they are already close in size and can both easily fit in same spots...
