Since it says in the rules we can use a 10g sump + 10g tank, If we opt not to use a sump can we use a 20g tank? I have lots of those, lol. Just checking. I wanted to do a nano seahorse tank with my juvies, but a 10 is just too short for them. If not I will not do a nano seahorse tank. I will have to do something else.

Thank you.
Angie