Trade logical transaction sizes:

Margin trading allows the fx trader a very large amount of leverage, trading at full margin capacity (in ACM’s case 1% or 0.5%) can make for some very large profits or losses on an account. Scaling your trades so that you may re-enter the market or make transactions on other currencies is generally wiser. In short, don’t trade amounts that can potentially wipe you out and don’t put all your eggs in one basket. ACM offers the same rates regardless of transaction sizes so a customer has nothing to lose by starting small.