Bubbles that form and pop right away should not be a problem. You could adjust the filter, power head, water level or something, then these bubbles would not form (or would be greatly reduced).
But the foamy sort of bubbles are linked to something in the water. Could be proteins and related materials, perhaps oils from your skin when you were handling the equipment and decor in the tank, but check the ammonia. Almost always this is from the break down of organic matter that has protein in it.
If there is no livestock in the tank this is a great time to do the fishless cycle, and you want the ammonia in there. It is encouraging the beneficial bacteria.
Happy fish keeping!
Although this does not work properly in sweet water - one needs very tiny bubbles, which are instable in sweetweater, but stabel i nseawater, in order to get this foam. BUT proteins can produce a foam, and proteins might, further, ahdere to solid surfaces, such as glass, leaving a slimey layer.
In case the layer is proteins, I would refrain from feeding the fishes for a week, clean the hard surfaces with a hard brush - obviously no soap - and change a lot of water.
However, if the layer is proteins indeed, I would also wonder whether the protein - ammonia - nitrite - nitrate system is still working.
I have added some carbon to the filter, don't know if it will help but feeling disheartened at the thought of stripping it all down.
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