Small in sump GFO reactor

[CivicS14]

My sump is the stock Red Sea Reefer that comes with the tank and have limited space (using the stock ATO container). Any suggestions on a small in sump GFO reactor?

 

[TheEngineer]

The Two Little Fishes reactors are pretty small. They can hang on the sump or sit inside.

The smallest of all is probably the little BRS canisters, but I don't know if you can get GFO to tumble in them.

 

[Dual40IM]

Innovative Marine makes a small one with built in pump.

 

[TheEngineer]

https://www.bulkreefsupply.com/brs-gfo-carbon-reactor-5-single.html