I have a small tank in the office. I went shopping last night for fish toys and found some Seachem cards that give constant readings for Ammonia and pH from inside the tank. No test strips, no sampling. I bought both of them and stuck them up this morning and they seem to be working great - it picked up my higher pH right away. I also want to be watching for nitrite and nitrates, though. I'm new to this so maybe this is a stupid question but is there anything like this for nitrite and nitrate? Any other levels I should be monitoring? Thanks!