In my 20 gallon I have 3 zebra danios, 1 bala shark, 1 rainbow shark, 1 rosy barb, and 1 plecostemus. They are all at their max. size, and have pretty good dispostions. None of them are upset easily. Would it be alright to add a spiny eel, or would that cause problems with my community? (I have already calculated volume, so that is not an issue).

thanks,

laurita