How big is your tank again? If it’s not too much for the hammer (or a torch) usually it’s not too much for a nem.
I also use the regular blue bucket

one of the issues I have is too much flow for the nems (which doesn’t take much). If their skirts are blowing up constantly, they won’t like that. At the same time, I feed them too much. When I feed the fish, the flow takes the food to them (small tank) so they eat every day. I only feed frozen once a day but I also have problems keeping nitrates above 0-2.
The nitrates are pretty easy, comes with a card and you can either look top down for a x1 reading or through the side for a x10 reading. Shades of pink. It’s mostly a tool to say “is it light pink, ok it’s 0-5. Dark-10+. I think it’s easy. Phos is more analytic/easy. You take 10 ml of tank water to calibrate, use the next 10 with an additive and it gives you a reading after 3 minutes.
Don’t be afraid to pm me if you have nem questions. I had a lot of questions first starting out and it was trial and error because not much info could be found.