Urgent help needed Salinity at 1.045 and stocked

Joined
19 Jul 2015
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Doha Qatar Middle East
Hi i need help my neighbors has a nano tank about 50 lt i tested his salinity and it is 1.045 he has 4 juvenile clowns 2 gobies and 1 hermit crab and a fire crimp in tank he has topping his tank up v salt water the hole time ni one told him to use ro water. I dont want to change the water to quickly to cause stress has been like that for over a month did a small water change got it down to 1.040 what must i do know
 

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