My wife added very fine sand to the tank and i've noticed our pleco and krebensis and shifting the sand often, is this normal for them to shift the sand?
Most fresh guys would suggest that you dont use sand in a freshwater aquarium, however, I do and havent had any issues with it. Now as far as your fish are concerned I dont know exactly why they would be doing that. My pleco doesnt burrow or anything of that nature but my dojo loach and clown loaches do all the time. That being the case if your fish arent exibiting any more "unnaturall behavior" than I woulnd worry about it. Wear did you get your sand from? How did you clean it? If there is an issue "which im pretty sure there isnt" parhaps we can get a better answer for you if we have just a bit more information.
sounds like they are cleaning it a bit ..
yep,sounds normal to me too.
Agree. Cichlids are notorious re-arrangers of the substrate, some species much more than others, but most all will do some of this. And sand being easily moved, it gets shifted whereas gravel would be hardly moved from its location but simply "chewed" and spit out. They are looking for food bits in the substrate grains.
Pleco, depending upon species, are active re-arrangers of substrate, or more precisely, they like to dig pits; many do this when spawning, and male pleco will often do this even if no females are present [they are optimistic one will come along and want to be ready] ;-). I had to place flat rocks in certain spots in my 115g to prevent one pleco from digging down nearly to the tank bottom, some 5 inches of gravel. Here again, sand is easier to move about so it would be more noticed that gravel normally.
I might consider a pre-filter sponge over the filters intake as well as shortening the length of the intake to keep it higher in the tank (not too much). This will help prevent sand from getting into the impeller assembly of your filter.;-)
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