So I found out this morning that 3 of the 5 tetra species in my community tank are from South America, and was wondering if they could live with my two silver dollars in a S.A community type tank? The dollars are the only ones in their tank at the moment, and the tetras I want to put with them are bloodfins, glow lights and black widows.. Will my dollars try to eat the male glow lights? They're tiny and I'm worried that my male dollar may try eating them coz he's fair size (about 15 cm). Any help would be very appreciated, and thank you in advance.