How much is too much? + unknown brittle star

[Ezreal]

I recieved an INSANE amount of dwarf ceriths by accident. I put about 20 in and I have the rest in the shipping bag.

I already have about 15 ceriths + 2 nerites, 2 Florida Ceriths, 10 zigzag winkles, 1 Limpet, 1 peppermint shrimp, 1 Emerald crab, 1 Pitho Crab, 1 serpent star, 4 quahog clams, 4 venus clams, 1 Hermit crab, 1 small Damsel fish.

I'm worried about overloading the tank. I have bio filtration only with pourous ceramic and a clump of reverse light cycle chaeto that I have to pull apart and throw away every other week. I also now do weekly 5 gallon water changes as I used to do bi weekly.

I'm concerned this is too much for my 15 gallon reef.

Also I can't identify this brittle. Its mouth is an orange red.

 

[James M]

Take them to a lfs and trade them in for something.
That’s a brittle star

 

[Ezreal]

Take them to a lfs and trade them in for something.
That’s a brittle star

I wish I could. The LFS is too far for me right now. Still recovering. It's such a shame I don't want to see these guys cone to an unfortunate end..

 

[James M]

Give them away locally

 

[Ezreal]

Give them away locally

I only have 2 people locally. Trying to contact them now.

Do you think I have overloaded my tank or will the filtration and water changes be able to keep it steady?