Hardscape looks awesome and that pogo and rotala is growing incredibly well! I cant wait to see it with the HC grown out, keep plugging away at it that stuff can be a nightmare but once it gets established its hard as nails! I always used to have trouble growing the stuff but once you get the hang of it its an easy plant to grow and looks amazing! One issue I have is the whole getting the CO2 just below the "point where fish start gasping" Iâ€™m not naming names but reading through this forum it seems a lot of high profile users just use fish as accessories to an aquascape sometimes it get to the point where welfare seems to be sacrificed. Adding fish or inverts even if its just a small cleanup crew when the conditions you are creating are borderline dangerous could result in loss or welfare, prolonged stress or outright death. Also in some other cases people are returning fish to a store to swap for others because "they donâ€™t suit the aquascape" is in my eyes both are a serious breach in animal welfare and is pretty much the same as buying a puppy to match a handbag keeping it zipped up in the handbag and then abandoning it when you get a new handbag... We are after all fishkeepers at the end of the day and we have a duty of care to these animals. If those fish have been gasping on and off over the last few days or weeks no doubt they are under some level stress even if they show normal behaviour at other times I understand you are trying to up the CO2 ppm to reduce the algae and encourage growth and the ottos are also in there to reduce the algae but you are playing with fire, choose either one or the other for the sake of welfare (Iâ€™m not saying get rid of the CO2 altogether just reduce it a little.) Also I see you introduced the fish whilst there was still a level of NO2, this should be avoided as even a small level of NO2 can be very toxic and stressful to fish and may cause long term damage. If a level is indicated this usually means that the cycle has not completed and introducing fish could have resulted in a spike with NO2 levels increasing to an even higher and more harmful level. Really sorry for being so negative towards you I donâ€™t want to spark an argument in your thread if anyone has an issue with what I am saying please take it to another thread rather than spoil this one.