Ok filled up the bucket with RO water (4 gallons worth) heated it up and got the pump going on it added the salt pint and a half and checked this morning over 14 hrs later and the hydrometer is going miles off the top (far too much salt) so my prediction was wrong.
Since then I have added more water and it looks like it will be "roughly" 8 gallonsof RO water for every pint and a half of salt.
I have the temp set at 25, is that ok or should it be higher? also is this the correct temp for the tank / fish when I get round to it?
Any temp, depending on what you plan to keep, between 79-82 is fine. Stability is more important than the set number.
I highly recommend that you toss out the hydrometer and invest in a refractometer. Your precious new marine system is worth the extra few bucks for the accuracy, precision and reliability gained. SH
Nearly there now all going good. the hydrometer is fine when im mixing the bucket but then when i check the progress of the tank it's a little under (even though when im mixing the water in the bucket to add to teh tank its perfect)
Should I add more salt to the tank to get it bang on?