Got a new company, algos set up – now need a broker. Would love your advice!

So we're looking for a broker that allows algo trading straight away, and without a huge amount of capital to start. One we looked at needs you to trade $15mill a quarter for 2 quarters first. Ideally fees and spreads would be low, and daily broker volume high to allow atleast a 1-10mill position size (leveraged) without moving their markets more than a pip on average. Any help much appreciated, thanks!