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What are tolerable low and high levels of copper for plants and plecos? Since the lake has been treated in the the past two years with larger amounts of copper sulfate, we are not able to keep plants or plecos. Other fish (Angels, Tetras, Gouramis) show no change or stress, but the plants and...

Bloodfins (A. anisitsi) are said to live in excess of ten years. Do other Aphyocharax have similar life expectancies? I'm specifically interested in A. rathbuni (Redflank Bloodfin, Green Fire Tetra). Are there any reasons to prefer one over the other?

I use KCl in my planted tank and want to add 6 to 8 Neocaridina denticulata (aka Minami Numa Ebi or Taiwan Shrimp). I have heard that you need to add Iodine when keeping shrimp. I've also heard that KCl is harmful to shrimp. My questions are: Is Iodine needed with these shrimp? and Is Potassium...