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[geologeek]

Hi i have a bit of a dilema! i have a four foot reef tank which i have only recently added a sump to! well if you can call it a sump! due to limited room in the cabinet and an unfortunate breakage of the tank to be used as a sump i have now used an 80 ltr plastic bin (HDPE - hope this is safe - shop assures me it is food grade!) which is mounted on a window ledge behind the tank. In which is the heater, skimmer and baskets containing algae (lit 24/7). The out flow is via a 1 inch PVC pipe at water level so the skimmer is always at optimal water level. NOW here is one for anybody to help! I want to add a water top off (ideally diy!) but it clearly cannot go into the "sump" and i am planning on putting in a tunze wave machine in the main tank in the new year so how can i add a top off unit as the water level in the main tank will be very variable!!!!

any suggestions?

I cant put an overflow box on the tank due to over the top bracing bars!

cant get the tank drilled without sending it away for two weeks! (welsh glasiers are crap!)

HELP!!!!