Coles Notes: I want to run flourite capped by aquarium gravel (about 5 m in size). Will this work well or is there a better route? I like the look of the natural gravel and have corry's in the tank.
I have a 75 gal lightly planted tank that i'm planning to do a substrate change on (do to need more than wants). The tank is running approx 1.6w/g of t5 lighting, pressurized co2, EI dosed (1/2 of required dose).
The tank is fairly heavily stocked, with cardinal tetra's, rummy noses, bosmani rainbows, precox rainbows, a pair of blue rams, endlers, juli cory's, otto's and an small army of amano shrimps (like 40 of them).
Currently i'm running sand blasting gravel in the tank with a bunch of jobe sticks to keep the plants happy. Unfortunally, the gravel seems to contain a little but of calcium as it is sending my kh through the roof. KH will rise from 4 to 8 in about 4 days.... tap water here has a kh of approx 1 and gh of approx 2... so time to replace the substrate.
I really do like the "light / natural" colour of the sand blasting gravel, and it goes really well with the dark coloured driftwood............ so black substrates defently won't look right in this tank
Now, after doing some reading, I've decided on
laying down 1 - 1.5" of the plastic crate. I am going to fill this crate with flourite. Then i'm going to top this all off with some "natural river rock" I purchased at the local aquarium store. the bag says that it is epoxy coated and will not alter ph or kh..... I dumped some into my 10 gal right now and will double check the kh values in a week.
The reason for doing the above is twofold.
a) the flourite is too sharp for the corry's........ hence the river rock cap
b) I don't like the dark substrate, hence the river rock cap.
Do you think this will work well? shoudl I also drop in a box of laterite mixed into the top layer of river rock to give the shallow root feeders some nutrition too???
Also, the reason for the plastic crate (those light diffuser pannels) is so that when you gravel vac, I won't mix the substrate.