Wondering if I could add 1 more fish

[BaraBlu]

Hey everyone, small question for my tank. It's a 15 gal with two clowns, yasha goby/peppermint pistol, and Mandarin dragonet. I've got my cleanup crew too being some hermits and snails. Besides them just my coral. I was wondering if I would be able to add one more fish if I could. I replace the filter sock regularly and have a skimmer on it with extra rocks in the back sump. Water changes every week with it being 2.5 gals each time. I was just wondering since my yasha never leaves it's burrow (obv) and my dragonet likes to chill in the rock work and lower levels. The clowns are normally together so there ends up being a lot of empty space that would be cool to add other being in. All this is just out of curiosity and if I was to I'm able to do more cleaning if it would be necessary, my nitrates are around 5-10 on average with my schedule. If not all is good since I love how it is alr, would be nice to have another friend in the tank though haha :)
Lastly the tanks been running since March.

 

[lil sumpin]

I think you're already pushing it with 4. I have 3 fish in my 14gal and I honestly cant wait to get them into something bigger.

 

[KrisReef]

 

[RV Reefs]

I think you are maxed out on capacity. Also, you could probably do 3-gallon water changes.

 

[littlefoxx]

My 15 gallon only has my two clowns and thats it

 

[Cali Reef Life]

Dont get any more for that size of tank. You'll want to upgrade to a bigger one wait till then.