I have a 12 gallon long planted with java, anubias, hornwort ect with drift wood. External finnex 360 and a sponge filter appropriate for up to 20 gallons. Current occupants are 1 female honey gourami, 6 chili rasboras, 2 zebra nerite snails and 6 neocaridina. I'm curious if I would be okay adding 6 more chili's and later on about 5 or 6 more neocaridinas. Everyone is getting along perfectly well. I do water changes once a week. I'm interested in keeping the bio load low,I'm not trying to reach max compasity by any means. About where would this put me?