Pros- the tank is bigger so more room for corys, and shouldnt have much impact on Bobs necessary 10gals. It will mean i can take down the smaller tank, saving on space and plug usage. Bob's mouth is very tiny (about the size of one small pellet such as hikari lionhead) and he wont be able to fit a cory in his mouth, they are nearly the same size as him! Also, presumably they will clean up the bits of food that Bob misses.
Cons- will the corys be scared in a bigger tank and need more of them to school happily?? i dont want to buy any more. they have been together for quite a long time and they have their own little hidey cave which i will put in the tank. Will they disturb/hurt Bob? Do they need gravel? they have it at the moment but Bob's tank is barebottom.
The tanks are the same temp, and i figure the params will be more stable in the big tank than the smaller one due to the larger volume of water, despite the extra waste of the corys.
What do you think??????
thanks