12-13-2007, 03:14 PM
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I agree, and would keep count on the guppies. Now that he's grown enough to eat them, and matured enough to have that hunting instincts take over... your guppies will be food soon enough.
The other thing I've noticed is how shallow the gravel is at the bottom, and how large most of it is. This could also be an issue, as these guys like to bury in the sand. If they don't have anywhere they feel comfortable hiding, they will change their behavior to accomidate it. It is highly likely that he is now too big to burrow comfortably. If you can provide him with a deeper substrate of smaller gravel or sand, he may just go back to hiding down below. (This won't change his hunting instincts, however, and that means the guppies are still in danger of becoming food at anytime now).
Also, watch your water params. Your eel is a scaleless fish and will be affected much quicker than the guppies if something shifts. Any ammonia or nitrite would be toxic, and will also burn their skin. If nitrates get over 40 it has the same effect. An uncomfortable eel is going to act differently. When you notice something changes in behavior in your fish, you always want to test for ammonia, nirite, nitrate, and pH to look for any possible dangers. As fish grow (and in the case of guppies, breed) the amount of waste in the tank increases gradually. This means that maintenance should also increase or a larger environment should be provided. Because we can't see the waste it's hard to know when it becomes a problem. Water testing is the only way to know. What size tank is this?