UV filters can be useful, they need to be powerful enough and have the right flow to work properly.
But as stated your tank is cycling (look into it on this site if you don't know about it there is info on a sticky) and you should wait until that is complete before worring about much else.
But as stated your tank is cycling (look into it on this site if you don't know about it there is info on a sticky) and you should wait until that is complete before worring about much else.
