Walls Of Tank Options

[Puppies]

Hi All;
Extremely new to this forum... Didnt know there are so many experts here on goldfishes...
I have a 3 feet tank. read in previous posts that a sucker will not clean up your tank.
My walls of the tank is coated with a layer of slime, not algae... how do i go about removing that? it blurs the tank...

And, if i put stones/ pebbles (gravel) in the tank, how big the size of gravel I should have? I refer small stomes that can let the fish gup into their mouth, and spit out... is it advisable?.. as i read in previous threads that its not wise as it chokes and result in death of fish... But small pebbles at the base (abt half inch of height) looks good.

And how do we clean the poos trapped between the gravel? mine is a overhead filter...
Need advise,.. thanks in advance..>>>

Rgds;
Puppies

[desireless]

For pH yes, best to buy a Test Pen. Result is almost instant. I have not been using it for a very long time, ever since I started buffering my water. But it is still good to have one handy. It is quite ex... about $40 for a cheap one. But it is worthy of the money spent.

For Ammonia, you can buy a test kit or you can alternatively go for the cartoonic "Ammonia Alert" by Seachem. About $8.90 from Darwin, $9 from PetMart. But again, once your tank is cycled, there is hardly any need for this because it will always be yellow(safe) colour.