Hello everybody. I had a thread running in diagnosis and disease and since the emergency has passed I decided to start a new topic that will hopefully be shortlived. First my vitals:

tank setup:
36 gal bowfront
Aquaclear 50 power filter (200gph)
undergravel filter with 2 Aquaclear 20 powerheads (126 gph each)

2 Pearlscales about 3" each
1 Ranchu about 3.5"
recently deceased 2 small celestial eyes.

We just went through a tough time losing the celestials to ammonia/cycling with fish and have learned waaay more about ammonia, nitrites, pH, kH and gH than I thought there was to know, unfortunately too late. The tank is still cycling (1 month so far) and at the moment I am about to do a 50% w/c as we are at .25 ammo and 1 ppm nitrite. My main question here though is about my tank setup.
I now understand the 10X gph/gal and when taking the power filter 50 into consideration we are 160 gph low. But don't the 2 20's come into play also or are they working against the 50 by sucking downward while the 50 is sucking upward? Or am I getting a total 552 gph and very dirty gravel?

Bag that. What should I do? Get a bigger power filter and chuck the gravel filter as I have been told gravel filters are not a good idea with GF's? Or maybe get another 50 power filter (along with current 50) with the idea of keeping coral sand in it for my extremely low kH? Which is kinda where I am leaning.

Cost is not really a concern.

IMHO, UG filters are just awful. If you're the handy sort, you could turn your two power heads into a canister filter setup.

You could also make them sponge filters.

But if cost is not a concern, put them aside (you never know when you might need them), chuck the UG, and get another HOB or canister.

Yeeeeeeehaaaaaaw.
Took the big, hollow plastic Chinese dragon decoration out after reading about stagnant water getting caught in hollow decorations and wierd little whitish things flowed out of the bottom. They looked like 1mm to 2mm long and in the shape of a C. I immediately got the vacuum out and sucked 99% of them before they hit the bottom. Any ideas what they could have been? I don't know what loach poo looks like but maybe that is what it was cause he sure liked getting inside that thing. This ended up being a 5 gallon w/c. After new water we still read .25 - .5 ammo and .5 Nitrite. We then went to a new lsf we had not gone to to check them out and look into filters. To make a long story short we got another Aquaclear 50 power filter so the two working together are doing 400 gph and I turned off the powerheads to the UG filter. After work today I tested and here be the params:
Ammo = 0 !!!!!
Nitrite = 0 !!!!
Nitrate = 20
gH = 30
kH = 1.7 - 2.8 scale in the mid green area or 80-120 ppm on the strip
pH = 7.8

I was completely blown away. I was not expecting 0's. In fact I thought I must have done something wrong. Very cool.

The new filter has a sock mixed with the biomax and coral sand. I will be keeping an eye on the kH/pH and look forward to weekly 10% water changes rather than daily and plan to give the gravel a good vacuuming once I see evidence of BB's in the new filter.

Thanks for all the help to everybody with all the direction and suggestions

In my opinion under gravel filtration in a goldfish tank is a no-no. Goldfish are very messy and they will put enough muck and grime in the substrate without needing help from an UGF. I tried it once in a small tank with tropical fish and it was more trouble than it was worth. I would much rather go without the UGF and keep the substrate clean with regular vacuuming (or go barebottom) than to let all that mess build up.

If you can, see about setting yourself up with a good canister filter. They are wonderful, and I recommend one on any tank 20 gallons or above.

By the way, I took care of your double post.