I'm new to keeping marine fish but have kept tropical for a number of years and seem to be doing quite well with them. I bought a small marine setup from a mate of mine last week and he came round and got it all up and running for me and everything is going well with it. He said i should do a 10% water change weekly and it's getting towards needing the first one but i can't remember what ratio of saltwater and RO
to use. I've got 25ltr drum of saltwater and about 5 ltr's of RO
but i can't remember how much of which one to use and i don't want to get it wrong.
Any help on this would be fantastic as i love nothing more than just sitting watching them swim around without a care in the world