Sea Side Aquatics new collapsible acclimation/utility box comes in 4 different size RFC-100 (sm), RFC-200 (med), RFC-300 (lg), RFC-400 (xlg). Each unit divider can be removed (only on med-xlg boxes) to create one large unit. Adjustable hanging bracket can support 3/4" glass/acrylic panel and is compatible with rimless and euro braced tank. Acclimation/utility box can be fully collapsible to space saving size for easy storage. Acclimation/Utility boxes can be used to: - acclimate new fish into your system - quarantine finicky/shy fish - help clownfish host anenome - feeder fish holding tank (on predator system) - isolated seahorse or angler fish system within your display - social acclimate aggressive fish.