Originally Posted by
Urban Aquaria
With the use of seasoned media and inert sand substrate, it possible your tank has been cycled over the past few weeks. If you want to be sure, just do another test in a few days time, see if the cycle is stable and numbers are still the same.
The brown algae patches are diatoms, common in new tanks, you can clean them off or if you keep otocinclus fishes they will eat it. The brown coating in your hoses are a combination of algae and bacteria colonies breaking down organic material, just have to use a flexible pipe brush to clean them during filter maintenance.
For sand only substrate, you could try glosso or monte carlo, they grow via runners and can take in nutrients from the water column so even when planted in an inert substrate they can grow, just at a slower pace. You could also try inserting root sticks or tablets into the sand substrate and that will provide nutrients directly to the plant roots and improve growth (and avoid excess nutrients filling the water column too).
The clown loaches and cories will tend to uproot carpet plants when they sift through the sand though, so you may only be able to consider non-rooted plants tied to mesh (or maybe can even try gloss and monte carlo tied on mesh instead, helps prevent them from being uprooted).
Btw, clown loaches grow to 15-20cm in size, so you'll need to find a bigger tank for them in the future.
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