Yes it will!You should not put fish in a reef untill
QT this will create havic in your tank buy a 10 gallon and do a 10%
water change every day if no filter or etc. watch fish and make sure they eat when given the choice. Another way is to give the fish a fresh water dip prepare a freshwater dip with a filtered water with no impurities then dip the fish in for 20 seconds and put fish in a sterile tank if the fish has
ICH you don't want it to spread in main tank! Use copper base in Qt Tank to rid ich! DoNOT use copper in reef tank you will kill all specimens. If you don't want to go that route then I suggest buying 2 cleaner wrasses to help rid of ich they clean fish thats what they do in there natural world they eat parisites that effect fish they really do good just takes alittle while as long as they don't become infected. Ich is caused by stress and poor water qualities if you don't have a
skimmer and other proper equipment then you should try to get them and another thing is use
RO water only!!!! It kind of sounds like you developed new tank syndrome. A higher
salinity will not rid ich.It will only cause more damage to your setup.