I'm looking for some information about CIMB Wealth Advisor

I'm interested in the Unit Trust which starts with a minimum of RM1,000.00

I understand that you can top up the fund in denominations of RM200.

I would like to know if the RM200 is obligatory, meaning if I start with RM1,000
can I top up RM200 as and when I have the excess funds or do I have to top up RM200 every month?