I ran my 120l without a skimmer for some time, but I have to concede as my nitrates have crept up, even with weekly 25% water changes, I have now started using it again. So yes it is possible to run without one, just watch the stats.
and have to agree 3 fish and 2 shrimps are to many in a tank that size.
Yeah really just to agree with the above. I run a 15g ish tank without a skimmer for a year and it was fine but after having run one on my new tank I wouldnt go back to running without it.
Also agree the 3 fish in a 10g is too much. 2 shrimp may be ok, depends on the shrimp (2 peppermint shrimp would be fine but a fire shrimp and skunk shrimp might not do so well).
i thought the fish may be too much tbh but the stocking i thought about was 1 clown 1 royal gramma and 1 firefish. the shrimp would've ben a skunk cleaner. the other shrimp would've depended on whether to have a symbiotic goby and shrimp(dont know the names) which i would then not have the fire fish
Forget the royal gramma 10g is to small for it, I think its even to small for a clown to be honest.
a purple firefish would be fine, and may be 2 peppermint shrimps with small CUC.
There are not really many fish that you can put in a 10g tank
a skunk cleaner shrimp is also to big