adjust your drip rate so that your replenishment matches evaporation-if possible! it will take some tinkering and being right on is not totally critical except that you will experience some salinity changes. you may also keep an eye on your pH which you don't want to bump too much (if its too elevated back off on the drip rate).
didn't you also add something else like a plastic plant, or a background or a new LIGHT? perhaps i'm mistaken-:lol:
tg