Hello Rajesh,
I have that problem of build up on one corner of my glass canopy. It's where the bubbles come up from the air stone. It does come off with scrubbing and it wouldn't be such a problem for me if I gave the canopy a good scrub every week when I do a water change. I just use a scrub pad that won't scratch the glass and I keep at it untill all the build up has come off. Well to be honest sometimes I don't do a very good job, I quickly lose interest in scrubbing.
I think your gold fish will eat up your duckweed, that's what I heard people say anyways.
Good news- they left behind 25 mixed color fries, I hope all of them survive.
@Rajesh Sethi I scratched the glass using one of those pads with magnetic strips.
My plecos like to be given cucumbers and various squashes.
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