Well my testing kit should be in today. My question is will it work on green water?

My fish that are in there seem to be ok now and I just added some Tilapia yesterday as that was the only time I could get them and they were much smaller than the ones from last year.

I need to add my heater for the next few days as we had a nice cool down but I want my fish to grow as quick as possible since we are getting a later start this year.

Still using the old homemade filter that came with my tank as I have used the last two years but really need to upgrade it and add plants.