stocking 140g

Hi everybody! I have a 63” x 23” x 23” tank with a Picasso Triggerfish, Regal Blue Tang, Tomini Tang, 2 Occellaris Clownfish, Royal Gramma, Midas Blenny, Foxface Rabbitfish, Melanurus Wrasse and a Flame Hawkfish. I might add a Snowflake Eel later on. Will I be able to add maybe a lionfish...