Is this a rule or is there a bylaw for this deposit?
If its a rule then you can change it at any time with or without the approval of the OC. (but thats being a bit cheeky)
If its a bylaw, then look at the bylaw carefully. It will say who has to pay the deposit – owner, tenant, property manager. Then instruct your strata manager to collect from the nominated party.
The difficulty whether thi is a bylaw or a rule is that the tenant is unknown to you and MAY only become known if the property manager actually notifies the OC. Its an offence to not notify the OC of a tenant, but the common practice is non compliance.
Perhaps change the rule/bylaw to make the owner pay (They can then get reimbursement from the tenant). This is also a good strategy )owner paying) as they will be more vigilent in getting tenants to dispose of their unwanted chattels at the end of the tenancy. The OC withholds the owner s money and then its the owners problem to either return only part of the rental bond or chase the tenant for the withheld deposit.