Over th past few weeks I've noticed a kind of build up on my light fixture, the hood and filters. It's a brownish brust that i have no idea what it is or if it's harmful. It's also extremely unattractive. Please help, this is a 20 gallon high rather new, with only a few shrimp and a platy to start the nitrogen cycle.
"To look left is to look right. To look right is to look up. To look up is to look down." -Anonymous