I sent a private message to another user and got a response, so I'll add his thoughts here for the sake of completeness in the thread.
Originally Posted by gildedrain
Hi, I noticed on one of your posts in 2012 that you mentioned you have a 75g tank with AHSupply 2xT5HO 48" light kit and you were considering a third bulb for a noon burst.
I have 2xT5HO 48" from AHS and am trying to grow Dwarf Baby Tears. It's been 5 days and they're currently melting.
Do you think lighting is the problem, or not enough CO2?
Originally Posted by Seattle_Aquarist
I am still in the process of acquiring equipment for the tank; it is not set up yet.
In reading your thread I agree get rid of the bubble wall and cut back on your CO2 so not to cause fish distress. I used to do PPS-Pro but found it disappointing; the low doses of nutrients was starving my plants. I now do Estimative Index (EI) with much better results. Also keep in mind that your HC was no doubt grown emersed so what you may be seeing is the transition from emersed growth leaves to submerged growth leaves.
Hope this helps!
So if Ferts are the most important, then Seattle_Aquarist seems to agree.
All seem to agree about turning the bubble wall off. Your explanations make sense. We use diffusers to make the CO2 bubbles smaller so that more will dissolve into the water column. Big bubbles of CO2 would just float to the top and escape into the atmosphere, so this applies to oxygen bubbles as well. Bubble wall, gone.
Surface ripple increases the surface area for oxygen-to-water transfer at the cost of lowering the water flow at the bottom of the tank, so if this is a concern, a small circulation pump is the solution. For a gentle flow in a 75g tank, what do you think about the
If lights are the least important of the 3, I'm willing to try leaving them as is for now and adjusting Ferts and CO2. If they die, they die. I've stilled learned something along the way.
I tested the tank this morning.
Does 0 nitrate indicate that I'm not dosing enough fertilizers?
- 0 ammonia
- 0 nitrate
- 0 nitrite
- 6.6 pH
- 4.5 dKH
- could be emersed plants adjusting to submersed, we'll see
- add more fertilizers?
- keep CO2 steady at 2-3 bps?
- direct the outflow pipe to create a surface ripple
- leave the lights at 2x54w T5HO AHsupply reflectors (for now)
- maybe add a circulation pump