the tangs have been in here for over a year now and some of them even longer then that my filter system is a fuge made out of a 50 gallon breeder tank light skimming 1 week a month heavy macro growth gotta weed it out every 2 to 3 weeks now that i got rid of the covict worm gobies i think they are called the tank is alot more clear and the fish seem to realy like the new setup they are able to swim in the back and the front and threw the rock in one place the rock is ran down the center of the tank going in lenght not width everything looks great from the change on sunday
randy