Bad lighting and an immature tank are your problems. You are overstocked with fish, 5 damsels is too many to begin with, clarkiis get too big for a 29g, and your urchin shouldn't have been added until the tank was at least a year old. Your blenny and shrimp are fine, everything else, I would consider taking back to your LFS
, doing some research, and restock with 2-3 small fish max (including your blenny), maybe 1 or 2 more once the tank is mature (8+ months). Most of this is just my opinion though, your tank, your choice.
Upgrade your lighting to a T5 High Output (HO
) or Metal Halide (MH
) if you plan on keeping coral, or even farther down the road, anemones. I would grab a new test kit suck as API or Salifert because the supplies you get in starter kits are usually not of good quality. Get a refractometer if you are using a hydrometer for salinity/SG
as they are a lot more accurate.
Hope I helped.