04-14-2007, 09:18 PM
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Spiney eels behave very differently in a tank in which they feel secure than in one that does not provide them the cover they like. I have seen very few heavily planted tanks in stores. Spiney eels in a tank with a thicket or two of leafy stem plants will spend much more time hanging out in the plants waiting for delectable morsels such as neon tetras to swim by than they will buried in the substrate. In fact, digging themselves in is a sign of stress. I cannot recall which forum I was reading this on, but there is a fellow who keeps several and swears by it. I am convinced.
Frankly, I think the betta will be OK, and the glass fish probably. The Danios might be just too fast. Beyond that, you'll have some restocking to do. I'd make sure that any fish I had in with a spiny eel was over 2", and over 3" if it were torpedo shaped.
That said, if you did this anyway, after your schooling fish evaporate, you might consider replacing them with Congo Tetras or Giant Danios or SAEs or Roseline sharks.
Also, sooner or later your betta is going to have a go at your guppies.