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Ya I would say petricolas, they stay small and have personality. I have been waiting for my LFS to get more in for a while as I have two and even then they are cool to watch. Always cruising around looking for food.
Mog is correct, a gravel vac is the best thing to maintain the bottom of your tank. We can also try to help identify your unknown fish if you post pictures. It helps To know what fish you have so you can better imitate their natural habitat
i think #1 looks like cynotilapia jolo reef or metriaclima greshakei, but im not sure!
#2 looks like labidochromis caeruleus or metriaclima estherae.
i tried
and for bottom feeders,i like the rubber lip plecos too! and orange spotted sailfins, even though they need massive tanks.