There are several hidden things in the Forex business, including hidden fees, slippage, and manipulation. Some brokers may charge hidden fees or mark up spreads, which can eat into profits. Slippage can occur when orders are executed at a different price than expected, which can result in unexpected losses or missed opportunities. Manipulation can also occur in the Forex market, particularly in less regulated markets, which can lead to unfair advantages for certain players. Traders should research their brokers and remain vigilant for any signs of hidden practices to ensure a fair and transparent trading environment.