I have a bgk and a spiny eel. The eel burrows in the sand and today, the bgk tried this. I came home from soccer and his head is sticking up above the sand. Is this bad? The water parameters are: Ph 6.6, nitrite 0, ammonia 0, nitrate <5, chlorine 0, Gh 75, Kh 140, temp 78. It is a heavily planted tank with several caves. If this is bad, will he stop on his own or is there something I should do. This is the first time it has happened.