you are not going to be able to add perlite to the existing soil, if you transplant it you can add it to the soil you transplant it too,but not now, garden lime you can dress into the top of the soil, DRESS means mix a little into the very top of the soil, you can also add garden lime to the water you put into the soil, do not use fast acting garden lime,use regular garden lime,
ALWAYS PH your water to around 6,You can check your water run off by pouring ph balanced water into the container and catching some of it coming from the bottom of the container and check the ph from it,
If you are growing in dirt ALWAYS add garden lime, perlite is nice to add too, but not always necessary , depending on the type of soil you are using.
If you add any kinds of bird poop do not add it to anything that is a seedling,,and if you add it to anything be VERY VERY sparing with it,