This divider only fits 125gal Aqueon & Top Fin tanks measures: 72' x 18' x 23'. These are the 6ft tanks from PetSmart or Petco. It will not fit other brand's tanks or custom made tanks. It is buyers responsibility to verify the brand and size of the tank before purchase to avoid unnecessary returns.

If you need help verify the size, feel free to contact us, we will get back to you ASAP. The divider will leave about 2mm gap between the glass and the divider. It has 2mm holes for water exchange. It will divide fish 1inch or larger.

Please note: mini fish, new born fry or small shrimp may pass through. The acrylic divider is covered with plastic protective layers on both sides to protect it during shipping and handling. Before first use, remove the plastic layer to reveal crystal clear acrylic.