Fish w the low bioload?

[toor.attar]

What saltwater fish have a low bioload. Curious to know what you guys think are fish that don’t effect your parameters a lot.
Neon Gobies, and yellow clown gobies seem like some, what others?
Thinking about restocking my 15 gallon for some tinier fish.

 

[Mr. Mojo Rising]

my 15 gallon has 3 clown gobies (green, black, and yellow), 2 masked gobies, 1 neon blue goby, 1 redhead goby, and 1 royal gramma. The RG very rarely comes out, and when it looks ridiculous besides all those small fish, the RG is bigger than those 7 fish put together.

I do water changes every 1-2 weeks, and only a small hob to run carbon because of the leathers in the tank. I haven't tested in 2 years.

its an easy little tank, and pretty cool with the flashes of the tiny fishes moving around.