who are the inhabitants?
I rotate between pellets and frozen food and off the pump when i feed.
usually the water will cloud abit after the pump is up the water will be clear in a while.
Scraps are finished off by plecos and geos thou.
Some bite/small size pellets which can fit into mouth will be slightly better
I would base the food on the dietary needs of the stock. I assume these are smaller fish if you are feeding flakes. I have some smaller fish that eat flakes and have no more water quality problems than pellets. I avoid uneaten food by feeding in small amounts at a time. Nothing is ever left.
But as to the question of an alternative to flakes, there are a lot of brands that make small granular pellets. Again, can't recommend anything specific because don't know the stock.
Seems like you can feed them good sized pellets already since they are pretty big.
My side of the world Hikari is pretty much everywhere but price thou probably a bit steeper.
Probably factor in what your LFS carries in bulk.
For me I do feed market shrimp, frozen ghost shrimp manually from time to time as a treat for everyone.
The pellets are on timer once to twice a day with everything mixed
Aro - Hikari Food Sticks, OF ARG2, Hikari Carnivore
Geo,Uaru - Hikari Cichilds Gold, sinking..
Pleco - Hikari Sinking waffer.
Tube fed cos they have no chance against the cichilds
Rays - Hikari Carnivore