The greater the capital you have the greater your profits will be. For the minimal amount in trading it does not exist, you just need to choose what coin you want to buy with the capital you have. My first experience, with 0.025btc of capital I started trading on bittrex trading site. By researching, choosing a potent coin, within two months I got a profit of 0.32 (not just one coin bought)
Wow thats inpiring story. Because within 2 months you earn 0.32 bitcoin with the capital of 0.025 only.
Making a research is very gokd idea to grow your bitcoin because you can know wbhat coin have pitential to increase or not. So dont forget to make a research everytime you buy an altcoin.