Here is the setup from above
And it is filtered with unimax 500, slightly overkill. aproximtly 25 liter filtercannister. together with the aquarium it will be aprox 75 liters of water, all calculations are made to 75 liters of water, but it is still an 54 liter tank.
Iwould say that the circultion of water is not underestimated. The outlet is pointing towards the co2 outlet to try and make it give good resolutio, thats why the outlet is so long.
H.
Hi H,
i wasnt trying to suggest and underestimation of circulation capabilities of your filter, but an issue with how it is distributed. If you have the same species of plant within the same aquarium under the same lighting, and some are performing more poorly than others, this points to a distribution issue.
Im guessing from what you have said that that is not a spraybar, but an extended pipe to get greater flow onto the diffuser. Im no expert on the forces of water but i think this way you will get a lot of wasted energy as the water will be forced downwards when it hits the right side panel, instead of creating a nice circular pattern around your tank. It may be better, if you dont want to use a full length spraybar, to infact shorten the return pipe so that there is less force at the right hand side, and more draw from the left. This way you may increase the efficiency of your filter rating and create a better circular flow pattern.....somebody else may be able to add science to agree/disagree with this.
You could also try placing your diffuser directly under the inlet pipe of your filter so that c02 is drawn through your filter and distributed with the flow pattern from it.
It looks like the worst effected plant is the one to the very left of your picture, tucked in amongst the wood. Looking at your set up this is likely to be the area of least water movement, there is also has a large upright branch with hc on the top to block flow, so may go some way to explaining its issues. I notice also that the hc at the very left hand side seems less full than the rest so again may highlight a flow issue here.
The plant that is doing well just left of centre most likely receives a good flow of co2 and nutrients as there is nothing to block its path.
Of course it is difficult to see from a photo exactly what is happening with the circulation in your tank, a video could help, but it certainly to me points to distribution. With high light intensity, it is even more vital to have good all over distribution as any failings are quickly highlighted with struggling plants.
Cheerio,
Ady.