im not going to choose a tank untill i choose the fish, so i can pick the correct size that is required for that type.....im reserching first which should always be done. it will have external filtration if that helps, and would like scooling fish not bala's as i have two in my main tank and they get too big, does anyone know if rainbows are ok with glass cats i have two and a striped glasscat (the net says they are ok with neons and my one dwarf doesnt bother them)