hello
i have SW tank its 25 days old , no fish till now ,its 39 Gal (39x15.7x17.7) tank with sand bed 2,5in , 24 lb live rock , protein skimmer ,external filter 600 L\h about 158 G\h, internal filter 960 L\h about 253 g\h , 150 W 14K Metal halide..
and i have problem that there is something like oil or protein on water surface is it normal or not & if any one have any advice about my tank plz tell my
cuz its my first SW tank ...THX 
Danny
i have SW tank its 25 days old , no fish till now ,its 39 Gal (39x15.7x17.7) tank with sand bed 2,5in , 24 lb live rock , protein skimmer ,external filter 600 L\h about 158 G\h, internal filter 960 L\h about 253 g\h , 150 W 14K Metal halide..
and i have problem that there is something like oil or protein on water surface is it normal or not & if any one have any advice about my tank plz tell my

Danny