I would use the filters you have should be enough and run external heaters on the xp4s. I would not put gravel in the sand. No need.
I would also recommend led lights. I would not do all dark rock back and sand... too dark. Dark back is good. Also get holey rock as it is not as rough as lace and base rock
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Thanks.
Are you talking about the Hydor ETH external heaters? To my knowledge there are no others. Right?
My only hesitation with this approach (well there are actually two) is does it restrict flow through the filter? And, by having an inline heater you now loose heat as well if one of your filters goes down. I don't know, maybe not a big deal. Oh, and with 2 XP4's with 5/8" output and 1 FX5 with 1" output I could only run two Hydor's and with the largest size being 300 watts, that would only be 600 watts. I don't think 3 watts per gallon will be enough since the room the tank will be in gets down to 55 to 60 degrees overnight in the winter. I could jack the overnight room temp. up but that would have a big impact on my gas bill! Its an isolated room unused overnight with three cold exterior walls, cathedral ceiling and lots of windows. In other words an icebox to heat.
Any specific LED's you recommend? I'm hung up on not having infinite control over bulb color. Maybe that's stupid.
As for the rest. I do want a black background. Thinking of painting flat black. Good idea?
I'm leaning toward a mixed grain size sand substrate. I like the look of the CariSea Arag-Alive Indo Pacific Black Sand but altered to be darker with much less white. So here's what I like about it: mixed color to hide detritus/algae in between cleanings and the mixed grain sizes is cool. It has fine aragonite sand mixed with black volcanic particles. In a big tank I like the look of a mixed grain size. However, the problem with this particular substrate is this is MARINE substrate and it is LIVE sand full of ocean critters, well you know what I mean

I've heard you can rinse the hell out of it and then set it out in the sun or place in a warm oven to kill everything alive and then give it a good final rinse.
CariSea Arag-Alive Indo Pacific Black Sand (0.25mm-5mm):
Now to this I'd add maybe some
Eco-Complete Zack Black (4mm-10mm) substrate (a courser black particle size):
or Nature's Ocean
Natural Black Live Cichlid Sand (1.2mm-1.7mm):
Or skip the CariSea Arag-Alive Indo Pacific Black, and instead do salt and pepper (B+W) cichlid sand mixed with a little fine white sand, plus maybe some Nature's Ocean Natural Black Live Cichlid Sand (above) and some course black Eco-Complete Zack Black (also above).
The typical Cichlid B+W aragonite substrate (0.5mm-1.5mm):
Then to top it all off, and because I like to play mad-scientist and to fulfill my artistic needs, maybe throw in a sprinkling of
Rift Lake Substrates
Live Cichlid Gravel (6mm-8mm):
Now, for rock. By holey rock I assume you mean Texas Holey Rock. In a 180 that might bankrupt me. Out of the 3 contenders: holey, lace and base rock, I can't seam to find any of it locally. Yes the LFS have small bins of small fragments at a ridiculous price. No one has more than a few really small pieces. On line it seams that you can find boxes from 25 to 50 pounds, but even those are gonna show up with relatively small pieces.
I need large pieces (yeah some small are fine) but I gotta have some good sized pieces to make this work. And by good sized pieces I'm talking...well I don't really know but see the pic below...I'm thinking at at least 15/20, 25/30 pounders and even maybe 40 pounder would be so sweet. I just can't locate anything.
So if my choices were unlimited and I could locate it here's what I'd like to achieve:
Its from another website and it's identified only as "Texas Limestone Rock". I like that it is a little holey but not swiss cheese. I really dislike the swiss cheese looking holey rock.
Anyone know where I can get this exact rock?
Thanks for the great input and I look forward to more!
