tunze 240/3 problem (please help)

[dsztark]

hello

i've just started adding liferock and have problem with my 240/3 tunze skimmer.
i've moded it by drilling hole underneeth the pump to make it stronger.
now a lot of tiny bubbles come from the plastic part where the pump i put.

is it normal?
what to do!

regards

 

[rvitko]

This is normal. Especially if it was just cleaned and new installed.