Saffa, just guessing, but with 7 different sources, do you mean you actually buy your stock from anyof these ?
I don't know about anyone else, but I'm inclined to buy from only one reliable source, the advice is a constant, as is the quality so no worries about what I might be about to get. 6x neon's £7.50 in Bristol (UK), or 3x cardinals same price. If it's tetra's you want, don't rule our congo's, I reckon they're top, but not as 'hardy' perhaps.