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I keep seeing seeing what different things need to be at ppm in my tank. I know it means parts per million. For example, if I need to add ammonia to my 10 gallon tank to raise it from 2 to 4 ppm while cycling, how much do I add ? How do I figure out how much a ppm is ? My tank has been set up...

I'm trying to decide between HOB filters or internal double sponge filters for my 10 and 20 gallon freshwater community tanks. They're both new, uncycled tanks. I will have some type of floating live plant in both tanks.Pros and cons for each filter for any of you who have used both. I also...