largetank

I've got a 4foot by 3foot tank with a silver arowana about 10 inch maybe a little more and a black ghost knife fish about 11inch and a common pleco I'd like some fish to stir up my sand substrate alittle more but obviously can't add Corydora as my arowana will eat them any ideas appreciated its...

Okay, a lot of things I am hearing. I need to know which silicone would be best for holding a new piece of glass onto a 140 GAL aquarium. And also, re-sealing all the seams on the tank after I clean off EVERY bit of silicone. RTV108 GE SCS1200 Marineland 100% Clear Silicone Aquarium Sealant...