had berghia before in a 90gallon tank put 3 in and in 3-4 months saw 20-30 so they boom and REALLY get the job done i moved my 90 to a 180 and a hugh system now and still the other night i found 1....pretty cool, but need to have 2 or more to reproduce, hope i do some where..............best Apatasia killers out there......