Waterchanges can be tricky especially if you don't use enough dechlorinator. Public utility companies have been known to use varying amounts of chlorine and chloramines, so the same dosage may work fine one time and not the next. Also, if your tank is relatively new, then your chemistry could be out of wack. New Life Spectrum foods are all I use and have had outstanding results, including with the EBJ's. Place your EBJ's in a decent sized tank (at least a 55gal) bring the temp up to 80, and keep the water clean and they should grow very well.