Non-toxic aquatic plants?

cyanopanda

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Kitten
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Apr 26, 2015
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British Columbia
Hey everyone I was wondering if anyone knew of any non-toxic aquatic plants. I'm having a lot of difficulty finding anything on the ASPCA list that is aquatic and won't harm my boy. I will be covering the tank that the aquatics are going into but I'm pretty paranoid. 
 
If anyone specifically knows if  mare's tail (Hippuris vulgaris) is toxic that would be a huge help as well. I keep finding results saying horsetail (Equisetum arvense) is very toxic but it is a completely different plant (to my knowledge) and they just share common names. I would really love to keep the mare's tail I just bought but it is an emergent plant, so if it is toxic it has got to go.
Thanks!
 
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