I have a 20g with a 3.5" rainbow shark, 3.5" pictus cat and 2 zebra danios. the temp is 81F, ph is 7.4-7.6. it has all plastic plants, but a lot of rocky hiding places. I am looking to add some fish to the tank, but don't know what. I also have a 29g with similar parameters and (1) 3" zebra pleco, and (4) 1.5"-2" angels. i used to have all these together but it was obviously too much. I also want to add to that tank. i am willing to move the rainbow shark or pictus cat over to the angels, but still need some ideas for more fish. Any suggestions would be appreciated.