Looking good! Can't wait for the finished product so all of us can make a 20 long thread haha. With that aquaclear, all you have to worry about is the water fall moving your sand.
I have a canister in my tank that is rated for 70 gallons and the outflow creates plenty of current, a little bit too much to where the fish (including neons) were getting stressed even with the flow at half output. so as for the circulation pump, I would get one way less than 500gph haha. I really have no clue on what size circulation pump you should get, but i hope you find one with the perfect current, neons and cardinals shoal in higher current.
Oh and my plants are doing perfect with little to no algae with a t5HO 24 inch, with only one 24w bulb at 9 hours, so maybe try using one bulb first?
Have you thought about going with a small cardinal tetra school? More colorful to me IMO :D
What type of fertilization will you do?
100th post yay!
Funny you mentioned the aquaclear. I woke up this am to a none running aquaclear. It’s been sucking sand, and I guess too much sand. When it cascaded into the tank, it move the sand A LOT, but with proper water height, the sand barely moved. I have a prefilter on the aquaclear, but it appears to be too porous. :D Gonna get a better sponge or see if I can find something else.
Circulation pump is on the back burner, unless I change up the filter to something with alot less flow. I do agree 500gph should be too much. (Hey, it was on sale! :D)
The diffuser is junk too. It's a used fluval 88g, bubbles are way too big. I'm in the process of seeing if I can service it. I also have a second 88g. I'll see how that is. Otherwise, another atomic will be acquired.
Lights. I believe, and ime, excess light can be mitigated by more co2 ! Unfortunately this light doesn’t allow only one bulb. If light becomes an issue, I will try to increase co2, and/or adjust height of light (raise it). It currently has a 12,000K and a pink (6500K) light in it. Oh, the 48” light went ontop of the 37, and the 37 light went ontop of the 20.