Yes,the big one will eventually go into the 265 and the little peeker will be moved to the 180 where my marbled lancer also resides.Are you keeping them separate?
I started with 4 small decorous In a 75 but ended up with 1 adult. I found them to be one of the synos who don’t play well with their own type. Leaves the angelicus alone but wouldn’t trust it with another decorous.
so I would imagine there is enough room for 3. i tried a decorus with an euruptus in a 90g. Lost the decorus, rehomed the other. Now I have an angelicus.