I can help you out!
First, you'll have to answer some more questions for me though.
What is your EXACT lighting setup? How long are the lights on for?
Flourish Comprehensive is really only good for micro nutrients. It does not contain enough N, P or K
that plants require the most of.
Your water having 0 kH
is concerning. I have found that plants do best with some kH
is made up from Ca
. You've got loads of Ca
from the crushed coral, but not near enough Mg
I would gH
boost your water change water up to 6 degrees gH
using CaSO4 (gypsum) and MgSO4 (Epsom Salt). Do this in a 3:1 ratio of Ca
. So for 1 gallon of new water with a gH
of 0, you would need to add 350 - 375 of each compound. This will give you roughly 30ppm of Ca
and 10ppm of Mg
. That is the cheapest option, and allows for fully controlled dosing options. You could gH
boost with Seachem Equilibrium if you so choose.
Currently these are your fertilizer levels that you dose x 1 weekly:
I would double that dose, try x 1 after a water change, and x 1 @ 3 days later.
Look into Seachem Excel dosing to help with plants and algae. This is an algaecide that helps plants utilize CO2
while "killing" off some algae. Metricide 14 is a cheaper option, but it is a dangerous chemical so be careful!
Regardless of lighting, I would cut it back to 5-6 hours a day MAX. At least until we can get the plants growing nicely, and the algae to drop away!