That sounds good! If they are only two centimeters long, it will take another few weeks to months for them to fully mature and then you will be able to take pictures in full display enabling mich better determination. However, if you, as I hope, are going to participate in the census I would suggest you simply call them what you think they are – eg. bintan ct. (ct being commercial trade) you could also ask the reseller to find out what location they were caught at. This might help as well.
Your feeding is good however do not overfeed them. They do really only need small amounts of food and every leftovers threaten to spoil the water quickly.
Greetings Rafael