IME, Octocinclus is a better choice than the Chinese Algea Eaters.
I wish I knew that before I bought them...
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IME, Octocinclus is a better choice than the Chinese Algea Eaters.
I can't help you with selecting powerhead sorry.
For substrate for a tank that large would expensive if you picked it up at a pet shop. I would opt for Black Diamond sand blasting grit if you want a dark substrate or Pool filter sand if you want a light colored one.
You can try and look online for some driftwood. I don't have a very big selection of anything around me, so the internet is my source for supplies.
I guess it depends on how quiet you want the powerhead. Do you want a quiet one like the koralia or it doesn't matter? Maxi-jet powerheads are good or the Aquatop ones but they are loud. I had two koralias in my river tank as I have the tank in my room and can't sleep with all that noise from the other powerheads.
What kind of driftwood are you looking for? Bob's Tropical plants (Mgamer) sells some. I have manzanita in mine from Manzman. Both sellers can be found in the classified section of the forum.
You might want to re-think the gastromyzon. I found they are better in groups and would need a lot of current or they are not active. The heater might be a problem too as gastromyzons, from my experience, prefer cooler temps (72F or high 60s). They rarely went onto the sand and stayed either on rocks or the glass walls. Plus they need green algae and don't seem to touch the brown. I pick up my rocks from lakes/rivers around here. You just have to know which ones are safe to use.
In my opinion, go with the highest one depending on how much your livestock will like the current, if you choose to only get one. If they are going to like the current, maybe go with 2 1050GPH. I think one should be ok if you're just looking to have it be used as water movement on the opposite side of the filter. Also, just stick to the 5 clown loaches as they do get big and you are planning to add other bottom dwellers.