Depending on the type of light bulb you have, you may have low or high light. For example, 22 watts of T5HO lighting would be very different from 22 watts of CFL lighting.
You can try both DIY CO2 and fertilizers; both will benefit your aquarium.
Nutrafin Plant Gro provides micronutrients. Plants will also require macronutrients, so you may either want to look into commercially available products, or to use bulk chemicals (which will be cheaper in the long run).
I dose my shrimp aquarium with fertilizers, using the EI dosing regimen, and they seem fine.
As for how to perform water changes without sucking out the shrimp, you do it very carefully
You can also use some kind of screen (i.e. old pantyhose) over the intake of the siphon to prevent the shrimp from being sucked up.
You can try both DIY CO2 and fertilizers; both will benefit your aquarium.
Nutrafin Plant Gro provides micronutrients. Plants will also require macronutrients, so you may either want to look into commercially available products, or to use bulk chemicals (which will be cheaper in the long run).
I dose my shrimp aquarium with fertilizers, using the EI dosing regimen, and they seem fine.
As for how to perform water changes without sucking out the shrimp, you do it very carefully