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Hi all, I have searched around online but I'm massively overthinking the flow in my tank and can't seem to stop tweaking my wave maker in search of "optimum flow". Can anyone please help put my mind at ease?! I have an 80L (20g) aquarium that's about twice as long as it is tall. I have two rock formations with a "valley" in the middle. The rocks are placed up to the middle of the aquarium and there's plenty of space on all sides of them for water to circulate. In the larger rock pile, there's also a "tunnel" in the middle. I have a large canister filter (rated for an aquarium 5 times this size) with pretty good flow from the outlet in the right corner of the tank – manufacturers guidance says this produces 1100 l/h (250 g/h) of flow, but obviously take that with a pinch of salt. I also have a random flow nozzle on the outlet. On the left, I have an SW-2 jebao wave maker (the least powerful version). Both of these flow generators are in the back corners of the tank, pointing slightly at the surface and into the centre. Where these flow streams hit, they collide and push water down and left and right, so that it circulates back round to the top corners to be pushed out again. I am fairly happy with the "patten" of flow (two "circles" that flow around the two rock piles, essentially) but I can't decided on (1) the strength I should set the wave maker at and (2) what flow mode to use. Initially, I didn't think much about the flow and it was probably too strong, but since I've started adding corals, I can now visually see the effects of the flow in the movement of the corals. My question essential boils down to whether I should optimise flow for the corals or for the fish. I have two clowns, a yellow clown goby and a royal gramma. The clowns have decided to host the sand in the right backhand corner of the aquaria, which is great because I never see them. The clown gobby is a fairly new addition and sort of darts around but mostly hangs out near the clowns. The royal gramma has a cave that it hides in most of the time, also near the clowns. The result is essentially an empty looking tank with all the fish movement concentrated in the far right hand side of the tank. At first I put this down to fish being weird but I noticed when all the flow is off for feeding, the fish happily swim around the tank, including the gramma that is normally hidden. This has led me to question if my flow is too strong and so the fish are being restricted to the side of the tank with the least movement. It might also not be a coincidence that the fish are at the opposite end of the wave maker, which is undoubtedly more powerful than the canister outlet. On the other hand, I can't tell if I have enough flow for the corals. When I look at people's videos online, their corals are blowing around like crazy, whereas mine sort of gently move about, unless I really max the flow. Is coral movement a good indicator of flow? I believe I have good circulation, in that food moves all around the aquarium and I don't think there's any build up of detritus, but does good flow mean by corals should be swaying around loads? I've been fiddling around with the short pulse mode, constant mode, surge mode, and the strength of flow on the Wavemaker (it can do 500-2000 L/H) and can't really decide if one is better than the other. What I want is to ensure is that the corals move around enough in the water and that the fish aren't all piled up at one end of the tank. When I look on other threads people tend to joke that as long as the fish aren't flat against the glass, crank the flow up. But surely you want your fish to be able to swim happily around the tank? Having said that, I know the fish I have are not open water swimmers, and, if in the wild they would also generally stick to the rocks and have to "fight" the currents, then that's fine. It's just a shame that there's one half of the tank without any fish movement. Coral-wise, I have a mix of soft (zoas, leathers, gorgonian), lps (Duncans, goniopora) and "easy" sps (birds nest/pavona). I've only been adding corals for the last month or so and the tank is still pretty bare. Sorry for the long, rambling post. As I say, I've been massively over thinking this and just wish an expert could come and adjust it for me haha! Any advice would be most welcome! Chris
hello everyone! I am just about to get my DIY 15 gal peninsula aio going. just doing some last minute research. plan on keeping few fish and corals, no sps at this time. my concern right now is my return pump and circulation pump. return pump: Cobalt Aquatics Mini MJ 606 159gph circulation: Hydor Koralia Nano 240gph will this be sufficient? thanks
diogopmg posted a topic in Beginners DiscussionHello, I had a circulation pump, which stopped working a few days ago. I'm thinking to buying a return pump, because it's more cheaper! For my aquarium with soft corals how many gallon per hour would be better? Maybe 130 gph? Bye