jprp;3806310; said:
I HAVE ALWAYS FOUND THAT SAND KEEPS MUCH CLEANER AS FOOD AND DETRITUS MAINLY RESTS ON TOP AND IS PLAINLY VISIBLE-A QUICK AGITATION OF THE SAND ON WATER CHANGE DAY WILL PREVENT POCKETS OF GAS FORMING .
WITH GRAVEL NOT ONLY HAVE YOU GOT A HUGE HAZARD TO SOFT SKINNED FISH LIKE PIMS BUT FAR MORE CREVICES FOR FOOD TO FERMENT IN AND HARVEST FUNGI-ALSO UNDERGRAVELS WHEN PRESENT ARE A WASTE OF SPACE FOR LARGE FISH.
(SO THERE LITTLE GIRL

)
Definitely a big no on under gravel filtration. What a pain in the butt! Can you imagine me dismantling an 8'x4' under gravel system to try to clean it!?!

However, before I totally knock them, I've seen some well thought out set ups drilled with bulkheads on the bottom and an undergravel filtration system. It was pretty efficient on cleaning that gravel! But yeah, it took up space, and you better plan ahead and want to spend extra $ on thicker glass and drilling. Beside, I have Bernard and two nigers to take care of all my vacuuming anyways.
Without an under gravel, 1 inch layer of small, smooth gravel has always worked well for me. If you put in too much gravel (or anything), you're gonna end up with pockets. However, with these big cats, a layer of gravel like that all gets kicked around, and no one has ever had an ouchie, irritation, infection, or anything else. Of course, I guess it would also depend on what kind of gravel you're putting them on. I wouldn't throw in anything sharp. Like I won't use Flourite with bottom fish. That stuff destroys them! I could walk barefoot comfortably on the stuff I've always used.
As for sand... I get giant land cat sized turds in my tank that get buried in the sand. At first when I would find them stuck against the glass on the very bottom under the sand, I started to worry. However, the bulldozers in the tank that probably moved the sand their in the first place seem to stir it up and get it out. Even with my FULL two + inches of sand, Bernard still leaves craters everywhere showing the bottom.
SO, there. Now you have an entire speech on my experience using sand, gravel, and flourite. How did we get to this from moving fish to this? Oh, yeah. You started a tangent! Oh, and you officially can't call me "Little Girl." Found out that no I really am not a little anymore. Partied it up on New Years and it took me 3 days to full recover. Apparently, I'm not up to partying 4 nights a week and pulling 20 hour days. I knew there was a reason I gave it up like 6 years ago...