bugs in sump

The white "spide-like" critters are probably hydroids. The generally go three a three stage life cycle. What you're likely seeing is the second, or free swimming stage, that look like tiny jellyfish.

The "centipede" like bugs could be bristleworms.

Both are nothing to worry about and tend to indicate that things are going well in your "mini ocean"

i have the same thing i think, i had tiny creatures nd then i took a eye loop to look at them and they looked just like shrimp like things then while looking with loop it falshed out 2 claws looked like lobsters and they eat algea on glass cause some were turning green from it not sure what they are but my clowns love them,..tiny and white look like 8 leggs +2 lobster like claws that they keep folded up like praying mantis, but were so tiny to the eye they are specks????????