Them gold laser corys appeal to me the most. O.O But I doubt they'd be good for a 20 gal. I don't have massive filtration, just a 300L/h internal.Well i must be a really bad fish keeper, cos i've 70 ish corys in a 4 footer (55 gals) - naughty me!!! not enough floor space i hear peeps cry....
Saying that i have 2 big externals and they have a large w/c & sand clean without fail every week... and how many have i lost in the 3 yrs i've been keeping them that is a massive total of 3!!!
Although i wouldn't recommend it unless you have good maintainance & filtration
I forgot to say - welcome to the cory club jakey