My pearsei had to be moved from a 150 gal to a 300 gal Rubbermaid as adults.We'll see on the Pearsei. You really think one is going to get too big for a 180 with tankmates or you think the SDs are too big as tankmates? I am downsizing from 3 pearsei to 1 soon (have someone taking 1, maybe 2 in a week). I've had the cichlids Since March and the biggest is probably only 7". I keep the tank warm and do 2 40% water changes a week but maybe I'm underfeeding.
I have a 180 now, and looking at it, maybe for 1 adult pearsei, but that pearsei will make it look kids gold fish bowl.
By the way, I attended a talk by one of the leading ray experts, she goes to the Amazon every year, and runs a public aquarium ray exhibit.
When asked what she thought was the smallest tank one could keep the smallest species of ray in, successfully, her answer was nothing less that a 300 gal,
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