yeah, its an inlet, but i have holes drilled to break the siphon, 4 actually and i've tested it about 10 different times with different water levels in the sump just to check it. matter of fact i even drew lines and filling instructions on the sump in case my girl got motivated to top it off when iwasnt' around. wasn't gonna take any chances.
and i didn't know about the whole dino's thing. i'm from florida originally so i've definitly heard of red tide, but i never realized that happened from good water quality. i was always under the assumption that it was caused by really bad water ...i.e. sewage runoff (in the ocean) or something